I'd say the gift certificate from Target wins - unless the credit card was valid, and not just an offer!
Many years ago we signed Peanut up to the Audubon Society (http://audubon.org/) , so the kinds of lists his name has been sold to have been quite liberal-minded. (The note from the Red Cross is asking for a contribution to their 2008 Annual Fund Drive; not nearly as funny as a request for actual blood.)
On the other hand, we signed Harley up for a subscription to GameInformer (http://www.gameinformer.com...). No doubt his name will be sold to very different lists over the years.