S.T.
I go with the gift cards to Blockbuster video, Subway, itunes ($10 - but that's the minimum for itunes), local pizza place or spot where they all hang out, or junk food "gift basket" - chips, microwave popcorn, twizzlers, bottle of soda.
Since it's a school thing I'd avoid the body wash deodorant idea - he could get teased unmercifully. Also gotta be careful about sports team hat - in NY people are either a yankees or a mets fan - and the hat from the oppostie team would be stomped on. ;o)