TCG Plein is a Dutch marketplace for Pokémon Trading Card Game collectors, built around buying and selling directly between collectors. The platform brings together individual cards, graded cards, complete collections and sealed products, including booster packs and boxes, bundles, Elite Trainer Boxes, tins, collection boxes, theme decks, cases, displays and code cards. Visitors can browse a catalogue of sets and cards, search current listings, explore seller profiles and discover featured offers across a range of conditions and prices.

TCG Plein says it handles payment and shipping, with buyer protection on every order, iDEAL payment options and delivery through PostNL and bpost. Sellers can advertise products, while buyers and sellers can contact one another directly. The site also provides information for sellers, including commission tiers, DAC7 guidance and an API. Beyond trading, TCG Plein supports a collector community through Discord, where members can share card pulls, ask for advice and discuss the Pokémon TCG. The marketplace presents itself as being made by collectors, for collectors.