Hi Product Hunt! Solo founder here.
The itch behind this: every time a new trading card set drops, collectors end up with three tabs open. One site for the card list, another for prices, and eBay to see what things actually sell for. The sites with complete lists usually have no prices, and the sites with prices look and load like they were built in 2009.
CardOwners.com is one place for both. Every set gets a sortable card list with live prices, and every card and printing gets its own page with price history by condition and current listings. Prices refresh daily and the whole site is fully static, so every page loads instantly.
Live today: Pokemon back to the 1999 Base Set, Riftbound (the new League of Legends TCG from Riot), Disney Lorcana, and One Piece, complete down to every printing.
The surprise while building it was that the hard part is the data model, not the design. Card games are messy in different ways: One Piece prints alternate arts with the exact same collector number as the base card, Pokemon has printed its numbers six different ways over 27 years, and one card can exist in four finishes with wildly different prices. Getting "one page per thing collectors actually search for" right took more iterations than everything else combined.
Would love to hear which game you collect and what you'd want on a card page that isn't there yet. And if you spot a wrong price, tell me, that's the whole product.