Are TCGplayer and eBay the same company?

Not originally, but they are now connected. TCGplayer was founded in 2008 in Syracuse, New York, as an independent marketplace dedicated to trading card games. In 2022, eBay acquired TCGplayer in a deal worth up to about 295 million dollars, so TCGplayer is now owned by eBay while still operating as its own dedicated TCG platform. That means the two share a corporate parent, even though they run as separate marketplaces with different interfaces and audiences. It is worth knowing when you compare them, since shopping both can mean staying within one company. EvoMarket is independent of both, a separate marketplace for TCG singles sourced from vetted local game stores and trusted sellers, if you want an option outside the eBay ecosystem.