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When you think of the 2006 Kansas City Royals, of course you think: "World's most expensive baseball card." Meet Alex Gordon, whose Royals rookie card got printed by Topps even though Gordon didn't make the Major League roster. In fact, he's playing for the Double-A Wranglers. Topps caught the error and began cutting up the cards (hey, any chance of doing that with Derek Jeter?), but not before about a hundred of them got out. A fan named Jeremy Troutman found five Gordon cards in a Topps rookie collection at a Wal-Mart in Wichita, and now the things are selling for as much as $2,550 each — the hottest card in baseball. Sealed Topps Wal-Mart boxes, which may or may not contain a Gordon card, are going for as much as $250 on eBay.

Our favorite baseball card goof is the 1989 Fleer Billy Ripken, which contains a rather obvious obscenity on the knob of his bat. And of course any rare Ken Griffey Jr. card which depicts him healthy and in uniform.

The Card Costs Because You Aren't Supposed To Have It [ESPN]
Topps Wal-Mart Box Alex Gordon Rookie Card [eBay]