How about having the whole rebate thing dealt with after the fact. Give everyone that brings a game a numbered stamped rebate card for each game they bring. Tell them to drop it in the mail and you're people can mail rebate checks to all that send in coupons. That way a week or so after the show you get a check in the mail. The way you handle the preorder and registration process is top notch and the nice young lady that runs that always seems to get it right. I bet she could rip out the rebates in a few days after and everyone would get their money not just the few that were'nt totally spent by sunday and just couldn't deal with tracking down mike after for the money. Just a thought...
Tom