As my old group gets together to tell the stories of old times and old games, I'll be running some Drinking Quest, with a prize pool consisting of my gaming duplicates and such. I always bring stuff for the group to remind them of the old times and show them what is going on during the current times.
Biggest prize is probably a copy of Stars Without Numbers - somehow I wound up with two copies. Mongoose Traveller Pocket Edition (as the print is too damn small for my eyes), a copy of Gygax Issue #1, an orange cover UK edition of Tunnels & Trolls 5e (wound up with 3 copies thanks to Ebay) and some other random goodies to round out the pot. Others bring food, beer or chips - I bring the gaming ;)