I have given all sorts of forum based prizes such as credits from the credits mod. Sparkling user names etc.
Members on my forum are from all over the world and while some wouldn't mind giving me their postal address many others don't like to, so physical prizes are a no no.
I don't mind spending a few quid on a prize if there's anything on line that may appeal to members.
Any one got any suggestions for prizes or prizes you have given on your forums