eBay, it looks like a 1993 silver foil. If there's a Frank Thomas player collector out there they might be willing to pay close to the asking price for it, but I haven't paid more than $10 for any of these cards for the player that I collect. Even at $10 it was a red foil card which is a lot more rare than silver. I think the only players whose cards sell for considerably more have multiple player collectors who are bidding each other up.
But like the other guy said it never hurts to try.