So I checked the SF website and the price for having a booth is calculated by the "front-foot". If we were to get ourselves into, say, a 10'x8' booth spot in one of the exhibition halls, we'd pay for 10 front-feet. Rates are from $60 per front-foot to $100 per front-foot, based on the nature of the group. If we are selling stuff, it's $100, if we're taking orders, it's $80, if we're doing neither, it's $60.
I'd prefer just to have an educational booth, because I think we might have a hard time selling enough stuff to go from $600 to $1000 and make up the difference. Informational pamphlets, pictures of the space (if we have one by then, or concept drawings of what we want for the space if we don't have one), example projects (Spoonapult, etc), and maybe (MAYBE) some hands-on stuff (although that will attract a lot of kids and we don't want to give people the impression that we are a child-oriented group)(or even child-friendly, because as much as most of us like kids, having kids around the space a lot is NOT a good idea).
$600 is quite a chunk of change, but we have three months to raise it, which is really only 10 people contributing $20 a month. I think once we get our by-laws written and adopted, select a board, and determine a few other things, we'll have no problem getting people to start with monthly dues.