Buy One, Get One — when a gift beats a percentage.

BOGO — Buy One, Get One Free — sits in an uncomfortable corner of most operators' promotional toolkits. On paper it looks like the worst possible discount: a free unit is a 50% effective discount on the basket, with all the same Amazon fees on the free unit as on the paid one. In practice, in the right category, it converts new shoppers in a way that a 50% percentage discount cannot.

This episode is the case for BOGO in the categories where it works, and the case for never running it where it doesn't.

Why BOGO is psychologically different from 50% off

A "50% off" message tells shoppers the regular price is wrong. A "buy one get one free" message tells shoppers they're getting something extra. The maths is identical; the framing is not.

Categories where the framing matters most:

• Gift-ready products. Soaps, cosmetics, accessories, snacks — anything where a shopper can plausibly buy one for themselves and give the other. BOGO turns a self-purchase into two purchases without changing the shopper's behaviour.
• Sampling-friendly products. A buyer of a new fragrance, a new flavour, a new shade is more likely to take a chance if the second unit is free. The free unit often becomes the one that gets used (and reviewed).
• Bundle-building. Configure BOGO with a different second ASIN — buy the main product, get the complementary accessory free — and you've engineered a bundle without creating a new SKU.

The configuration choices that matter

Inside Seller Central's BOGO flow, three decisions decide whether the promotion makes sense:

1. Same-product BOGO vs. different-product BOGO

Same-product BOGO is the classic case — buy one, get a second of the same SKU free. It's the simplest to set up and the easiest to communicate. Different-product BOGO lets you nominate any ASIN from your catalogue as the gift, which is where the bundle-building cases live.

Different-product BOGO is where most operators leave money on the table. The free unit doesn't need to be expensive — a €3 add-on that complements the hero product can lift conversion on the hero by 10–15 percentage points while adding €1.50 of cost per unit sold.

2. The qualifying threshold

You can require the shopper to buy two, three, or five units of the hero product before the free unit triggers. The right number depends on the contribution margin you can defend at the effective discount, not on what feels normal — a "Buy 3 get 1 free" effective discount is 25%, not 50%, which often lands inside a margin you can stomach where straight BOGO doesn't.

3. Claim limits and stack rules

BOGO is the promotion most likely to stack accidentally with coupons and Subscribe & Save. A 10% evergreen coupon on top of a BOGO turns the effective discount on a 2-unit basket into 55% off, not 50%. Either remove the coupon for the BOGO window, or use Seller Central's claim limit to cap exposure.

Where BOGO does not work

BOGO is the wrong mechanic for:

• Single-purchase products. Power tools, large furniture, electronics. Shoppers don't want two of them, the free unit just becomes a return or a regift.
• Products with high return rates. Returns on BOGO orders are operationally awful — you eat the fees on both units even if only one comes back.
• Categories with price-protected MAPs. If you sell elsewhere under a Minimum Advertised Price agreement, BOGO often violates it in a way Money Off does not.

Measuring whether the BOGO earned its place

Two metrics matter for BOGO, beyond the standard pre-flight checklist from Episode 01:

• Incremental units sold over a comparable pre-period — and incremental shoppers, not just incremental revenue. BOGO that doubles units but not shoppers is just giving free product to existing customers.
• 30-day repeat rate on the BOGO ASIN. BOGO's strongest mechanism is sampling — if the repeat rate doesn't lift over the following month, the sampling hypothesis didn't pay out and the next round should be structured differently.