1909 T206 Honus Wagner Card

Don't stick this card in your bicycle spokes. A mint-condition 1909 Honus Wagner T206 card sold in 2007 for $2.8 million, a record price for a baseball card. Legend has it that the card was always rare because Wagner forced the American Tobacco Company to halt its production so that children would not buy cigarettes to get it - a noble thought. Unfortunately, the owners of the vaunted card haven't always been as upstanding as Wagner himself. After the card's condition was questioned for decades, sports memorabilia dealer and auctioneer Bill Mastro admitted publicly this year to trimming the card in the eighties so it would have sharper edges.

"There are certainly other baseball cards that are far more rare," Imler says. "But the [Wagner] card has a mystique."