Diamond 9 Sports / TCG is the Orange County card-show staple that keeps the local hobby humming week in and week out. The June 6, 2026 edition lands on Saturday at the Diamond 9 Sports shop at 1850 N Placentia Avenue in Placentia, just a short drive from Anaheim, Fullerton, and Yorba Linda. With 86 dedicated vendor tables and a Wednesday/Saturday recurring rhythm, it is one of the most reliable places in the OC to dig through deep inventory without having to wait for a quarterly mega-show.
As the name suggests, sports cards lead the room. Expect deep tables of MLB, NBA, NFL, NHL, UFC, boxing, and soccer cards across every era — vintage Topps and Bowman, the 1980s and 1990s wax that built the hobby, and a wall of modern Panini Prizm, Donruss Optic, Select, Mosaic, Topps Chrome, and prospect-heavy Bowman Chrome. Graded PSA, BGS, SGC, and CGC slabs sit in locked cases for the serious chase, and a healthy stack of dollar boxes and quarter bins keeps set builders and player collectors busy. Trading card games share the floor too — Pokemon singles and sealed product, Magic: The Gathering, Yu-Gi-Oh!, One Piece, Disney Lorcana, and Dragon Ball Z all get table space — alongside memorabilia, autographs, sealed wax, comics, Funko Pops, and supplies like sleeves and top loaders.
Hours for the Saturday show run 10:00 AM to 6:00 PM, giving you a generous eight-hour window to walk the room, compare prices, and circle back to negotiate on the cards you really want. Diamond 9 also runs a midweek edition on Wednesdays from 3:00 PM to 9:00 PM if Saturday does not fit your schedule, and because the lineup recurs, the next Saturday after June 6 lands June 13 with similar vendors.
Admission is a low door fee (typically around five dollars) that goes straight back into operating the show, and kids are welcome with a parent or guardian. Bring cash for the fastest transactions, since dealers consistently price best for cash, with Venmo and Zelle widely accepted as backups.
The shop sits just off the 57 freeway, with free parking on site and easy access from anywhere in north OC, the Inland Empire, and east Los Angeles County. Many regulars combine the show with a lunch stop in downtown Placentia or a quick dinner before the Wednesday night edition.
Who should attend? This show fits everyone — first-timers, families with kids on a Saturday morning, serious slab hunters, set builders chasing the last few cards for a player collection, vintage diggers, modern flippers, prospect hunters, and TCG players. The recurring, low-pressure format is especially good for newer collectors who want to learn the rhythm of a card show before tackling a bigger weekend convention.
To get the most out of it, arrive close to the 10:00 AM open for first crack at fresh inventory, walk the full room before buying so you can compare prices, and carry a sorted want list with target prices. Bring cash, pack a slab case and sleeves for pickups, and bring a trade binder if you like to deal across the table. For confirmed dates, hours, and vendor updates, check the Diamond 9 Sports listing on cardshows.io and follow Diamond 9 on Instagram and Facebook.