Trading Card Deal Calculator — price a collection before you buy

Stop guessing what a collection is worth

Buying collections is where vendors make their best margins — and their worst mistakes. Eyeball it and you either lowball a good deal and lose it, or overpay and eat the loss. The deal calculator replaces the guesswork: add the cards, see what each is really worth, and watch the running total build.

Price off real eBay UK sold data

Every card is valued against live eBay UK last-sold prices — the figures the seller themselves can check on their phone. That keeps your offer credible and grounded in what cards actually sell for in the UK, not inflated asking prices or US numbers.

Set your margin with a buy-% slider

Decide what you pay. Slide your buy percentage and the calculator instantly works the offer back from market value across the whole collection. Want to pay 60% of value on a fast-moving lot and 40% on slower stock? Adjust and see the offer update in real time.

Commit the deal straight to inventory at cost

When the seller says yes, commit the deal and the cards drop into your inventory at the cost you paid — so your margins are tracked from the moment you buy. No re-entering the collection card by card after the fact.

Built for buying at the table

It runs from your phone, works at shows, and pairs with the bulk scanner and CSV import so you can get a big collection priced quickly. The deal calculator is part of Vendor Pro and Store Pro.

What is a trading card deal calculator?

It’s a tool that helps you decide what to pay for a collection. You add the cards, it values each one off market data, applies your target buy percentage, and totals the offer — so you can make a profitable, defensible offer quickly.

How does it value the cards?

Each card is priced off live eBay UK last-sold data — recent real sales in the UK market, with condition taken into account — rather than asking prices or US figures.

Can I set my own profit margin?

Yes. A buy-percentage slider lets you set how much of market value you’re willing to pay, and the offer total recalculates instantly across the whole collection.

How much does it cost?

The deal calculator is part of Vendor Pro and Store Pro — £14.99/month, with a founding rate of £5/month locked forever for early subscribers. CardSeeker has a free plan for inventory, events and offline access.