Q4 Pricing for Marketplace Sellers: Deal Windows, Lookbacks and Margin

The price a product carries in October decides what its Black Friday price is allowed to be. The Black Friday price decides what January looks like. And the fees underneath both move in the middle of the quarter. Pricing in Q4 is a sequence, not a number, and a seller who sets each price on its own day is setting each one against a reference they did not choose.

This is the sequence for a seller on more than one marketplace, with the rules each platform applies to a deal price, the fee changes that move the floor, and the order the prices should go in. The figures below are Amazon's announced ones for holiday 2026; the method applies everywhere.

Q4 pricing on the marketplaces is a sequence. Hold the everyday price steady through October, because it is the reference every deal is judged against; run each event's deal price as the deal alone, with no coupon beside it; go back to the everyday price the day after each event; and match the Black Friday to Cyber Monday price across marketplaces on the same days.

Price every deal from the new floor, not the summer one. Amazon's peak fulfilment surcharge of 3.5% on FBA fulfilment runs from 15 October 2026 to 14 January 2027, and carriers add peak surcharges of their own to merchant fulfilled orders, so a discount that was affordable in August can leave very little in November once the surcharge, the deal's fees and the advertising beside it are paid.

Two rules decide the order. Prime Big Deal Days promotional prices are excluded from Amazon's 30 and 60 day lookback windows, so the October deal does not become the reference the November one has to beat. And Walmart can suppress a listing whose price is beaten elsewhere, Amazon included, so a deal on one marketplace has to be matched on Walmart on the same days.

Before the first event, give every repricer a floor per product that includes the surcharge and the deal fee, and pause the rules that follow competitors during the event weeks. After the last shipping date the price becomes a stock decision, product by product: what January should not start with is priced to clear, and everything else goes back to its everyday price.

Amazon's peak fulfilment surcharge applies from 15 October 2026 to 14 January 2027: 3.5% on FBA fulfilment, an average of $0.32 per unit. On a product with a $6 fulfilment fee it is about twenty cents; on a bulky one it is more. Carrier peak surcharges do the same to merchant fulfilled orders on eBay and Shopify, on the carriers' own windows. The floor under every price in the quarter is higher than the summer spreadsheet says, and the first job is to rebuild the unit economics with the surcharge in. What it costs to sell on Amazon is the fee stack; the surcharge goes on top of it.

A deal is then priced from the new floor. A 20% deal on a product with 30% margin in August is a product with under 10% margin in November after the surcharge and the deal's own fees, and the advertising that runs beside it is paid from the same ten points. The deal is still worth running when it buys rank or clears stock; it is not worth running because it is November.

Amazon judges a deal price against the product's recent price history, so that a discount is a discount from a price the product actually sold at. Two things follow. A price raised in October to make a November cut look deeper does not work, because the reference is the price over the window, not the price on the day. And a price cut in October, if it counts, becomes the reference the November deal has to beat.

Amazon's rule for 2026 is the one that decides the sequence: Prime Big Deal Days promotional prices are excluded from the 30 day and 60 day lookback windows. The October deal does not set the reference for the November one; both are judged against the everyday price. A plain discount run alongside the deal should be assumed to count until Amazon says otherwise, which is why the October offer should be the deal itself and not a coupon stacked beside it.

Walmart has no deal fee and a stricter price rule: a listing whose price is beaten on another marketplace, including Amazon, can be suppressed, so a Black Friday price on Amazon has to be matched or beaten on Walmart on the same days or the Walmart listing goes dark in the week it was stocked for. Walmart pricing strategy sets out the rule. TikTok Shop's campaigns require a discount depth against the product's listed price and check it; eBay has no lookback, only the sale price tools and the buyer's own memory.

Every discount on a core product writes a lower price into its history, and the lookback rules make that price follow it into the next quarter. A seasonal bundle is a way to offer value without touching the core product's price at all.

A new product, a new price. A gift set or a seasonal bundle is listed as its own product, with its own barcode and its own price history. Its price can be generous for the season without lowering the reference of the items in it, and it can simply stop being sold in January.

Built for the gift buyer. The holiday shopper is often buying for somebody else and comparing on presentation as much as price. A set that solves a gift, with the right items together and packaging that looks like a present, can carry a better margin than either item discounted alone.

The cost to plan for. A bundle needs its own GTIN, its own listing and its own stock built in advance, and on Amazon its main image has to show exactly what is inside. It has to be planned in the summer, alongside the season's purchase orders, not invented in November.

What to leave alone. A bundle that undercuts buying the items separately by a large margin teaches shoppers to wait for it. Price it as the convenient choice, not the cheapest one.

The image and identifier rules for bundles are in multipack and bundle main images.

October, before the first event: the everyday price, held. This is the reference every deal is judged against and the month to establish it, which means no coupon, no stacked discount, no price test. A product whose everyday price has drifted down through the year has a small deal available to it in November; the fix is to let the price sit at its real level through the lookback window before the event.

The first event: the deal price, as the deal and nothing beside it. Then back to the everyday price the day after, on every marketplace, because the everyday price is what the second event is judged against and what Walmart is comparing.

Black Friday to Cyber Monday: the deal price again, matched across marketplaces on the same days so Walmart's rule is not tripped, and back up the day after Cyber Monday. The gift weeks: the everyday price, with the delivery promise doing the selling. The tail, after the last shipping date: the price that clears what January should not start with, which is a decision by product and the subject of the post holiday planning article in this set.

The fourth quarter is the one time of year a seller runs several prices on the same products within weeks of each other, which makes it the best price test most sellers will get, if it is read afterwards.

Units at each price. For each product, record units sold per day at the everyday price, at each deal price and after the season. The jump in units at a deal price, against the days before it, shows how much the discount actually moved.

Contribution at each price. Multiply the units by what each one earned after every fee, the surcharge and the advertising spent in those days. A deal that tripled units and halved the contribution per unit made more money; one that doubled units and cut contribution by two thirds made less, however good the sales chart looked.

What came after. Read the weeks after each event. Some of the units a deal sells are sales borrowed from the following weeks, and a dip after the event is part of its cost.

What to carry forward. For each product, the deal depth that earned the most contribution, and the ones where no deal earned more than the everyday price. That list sets next year's deal plan, product by product, rather than a single discount applied across the catalogue.

An automated repricer that is chasing the buy box on Black Friday is a repricer that will follow a competitor's deal price down and set a new reference on the way. The rule for the quarter is a floor per product that includes the surcharge and the deal fee, set in October and not overridden on the day, and a pause on rules that match competitors during the event weeks, because the competitor's price is a deal price with a fee behind it and a date it ends. The repricing strategy article covers the rules for the rest of the year.

Somebody always goes lower in November. The decision is whether to follow, and following by reflex is how a season of good sales ends with a poor margin and a lower reference price for the new year.

Know the floor before the season. The lowest price each product can carry and still earn its target contribution after the surcharge, the fees and the advertising. A competitor's price below that floor is a price the product cannot match profitably, and the question becomes what else to do.

Ask why they are lower. A competitor clearing stock it over-ordered, one buying rank with a loss leader, and one with genuinely lower costs are three different situations. The first two end, often in January. Matching them makes their problem yours.

Compete on something other than price. Faster delivery, a better listing, more reviews, a bundle, or advertising on the searches where the product converts best. Shoppers in the season compare more than price, and a product that holds its price with a better offer keeps its margin and its reference.

On a shared listing, the rules differ. Where several sellers offer the same product, the buy box weighs price heavily, and holding a much higher price can mean almost no sales. There the floor decides how long it is worth staying in, rather than whether to match at all.

For the brands we run, this sequence is the quarter's unit economics work: the floor rebuilt for the surcharge, the everyday price held through the lookback, the deals priced from the floor and matched across marketplaces, and the repricer told what it may not do.