Ryan Cracknell over at Trader Crack's Blog clued me into the 2010 Upper Deck Baseball SP's (short-prints) that are inserted into retail packs found at Target and Wal-Mart.
Packs at Wal-Mart have a Sarah Palin and a Pete Rose. Target packs have a "Shoeless" Joe Jackson and a Yankees tribute card. According to Upper Deck these cards are very rare, but did not offer up a print run.
As of this post, the only 2010 Upper Deck Sarah Palin Sp to hit eBay sold for $49.00 on 10 bids on 2/15/2010. I also only found one 2010 UD Pete Rose Sp, it sold for $25.25 with 12 bids. I didn't see any of the Upper Deck Target Sp's hit eBay yet.