Tools & calculators
Every OP Compare tool in one place. Price-check a card, work out whether a box is worth ripping, and build or price decks for less — most need no sign-up at all. A free account adds a watchlist of up to 10 cards, a portfolio of up to 50 and the top rows of each deal list; Plus lifts those limits and shows every deal with no ads, and Premium works out the cheapest way to buy a whole want-list.
The price tools here run on the same data as the rest of OP Compare: the prices our twice-daily import reads from stores, TCGplayer and eBay in six markets — the US, Australia, the UK, Singapore, Canada and the EU. Each answers one question: what a card or a whole list costs, whether a box is worth opening, whether a trade is fair, or what you keep after selling.
A price is an item price unless a tool says otherwise; Best Basket is the one that prices whole orders with each store's measured postage. None of them forecasts where a price will go. Where to buy One Piece cards compares the stores behind the numbers.
Buying & value
Deal Finder
PlusUnderpriced vs TCGplayer: the cards a real store sells for less, in your currency, biggest saving first — narrowed, with Plus, to only the cards you watch.
Rising Cards
PlusCards with high or rising demand whose price hasn't moved up yet, each with the reason it ranks.
Best Basket
PremiumBuying a whole list? The cheapest delivered order across your country's stores, postage included, at the condition you'll play — see your total free with an account.
Demand Finder
PremiumThe cards players are searching for and opening most, over 7 or 30 days. The top 10 most searched this week are free.
Your collection
Sealed & boxes
Decks, trading & selling
Deck builder & list pricer
Build a deck, or paste any card list, and price every card across stores as you go.
Trade calculator
Value both sides of a card trade fairly before you commit.
Selling fee calculator
What you actually keep selling a card on TCGplayer or eBay, after commission, processing and postage.
Read next
- Where to Buy One Piece Cards: 6 Markets ComparedHow the six markets we cover compare for singles and sealed
- One Piece Booster Box Prices: Every Set Compared (October 2026)What a booster box costs in each market, and where it is cheapest
- Are One Piece Cards Cheaper Abroad? US vs AU, UK, CA, EUWhether a cross-market price gap survives postage and import tax
Frequently asked questions
Are the OP Compare tools free?
Most of them. The box EV calculator, deck builder and list pricer, trade calculator, selling fee calculator and sealed prices need no account at all. Deal Finder and Rising Cards show nothing when you're signed out, the top 3 deals and top 3 rising cards with a free account, and every row with Plus, which is also ad-free. Best Basket shows your own list's delivered total with a free account; the store-by-store plan is part of Premium. Demand Finder shows everyone the top 10 most searched cards of the week; its full most-searched and most-viewed lists are part of Premium.
What does the Deal Finder do?
It lists every One Piece card a real store sells for less than TCGplayer's US market price, converted into your currency and ranked by how far below it is, and you can filter it by store and, with Plus, narrow it to only the cards on your watchlist. Signed out it shows nothing, a free account sees the top 3, and Plus shows every row.
Do I need an account to use OP Compare tools?
Not for most of them. Browsing, comparing prices and running the calculators need no account. A free account adds a watchlist of up to 10 cards with new-low alerts, a portfolio of up to 50 cards with a set checklist of what each set is missing, the top rows of Deal Finder and Rising Cards, and your own Best Basket total. Plus adds an unlimited watchlist and portfolio (a whole set fits), every row of both lists, target-price alerts, sealed watches on up to 10 products (an alert when a box is back in stock or at RRP) and an ad-free site; Premium adds a deck price watch (a saved list re-priced delivered after every update, up to 10 lists), Best Basket's store-by-store plan (at the minimum condition you set) and the full Demand Finder.
Which One Piece tool should I use to buy a whole decklist?
Best Basket. It searches store combinations for the lowest total including postage, and with Premium shows the best one-store and two-store orders beside it. Any signed-in account sees its own delivered total; Premium shows which store to buy each card from.
Is a One Piece booster box worth opening?
Use the box EV calculator: it compares a sealed box's live price against the expected value of its pulls at current singles prices. Bandai publishes no pull rates, so its rates are community estimates set low on purpose, and you can change every one. As a rule, buying the singles you actually want is cheaper than opening product for them.