8' is a standard booth width, sometimes it's 10'
it's worthwhile to have your own tables - at least some of them for other events, fairs, tabling in front of grocery stores, etc.
These are the ones that have folding legs, and then fold in half so they fit in a car. They come in 6 and 8' lengths and you should be able to find them for less than this:
http://www.amazon.com/Portable-Plas...6DFS/ref=sr_1_5?ie=UTF8&qid=1305527982&sr=8-5
Here are the tents I was talking about. They come with and without walls, get the walls. Some brands are "First up", "E-Z Up Sierra" and "Swiss Gear Smart Shade". Places like Walmart discount and put them on sale going into summer:
http://www.amazon.com/Commercial-In...sporting-goods&ie=UTF8&qid=1305529707&sr=1-10
The one I linked to is a commercial grade one - useful only if you are doing this a lot. For infrequent use, a lighter one should work, but if you're looking at really heavy crowds you will want the heavier poles. Lighter ones should be $100 or less on sale.
another more delux one on sale, from the same supplier - and it's less expensive!
http://www.hutshop.com/ezupcanopies.html
I'm not sure on the commercial ones, but the personal "gazebo's" the poles break down and the whole thing fits in a carrier a bit bigger than a golf bag. ie: toss it in a car.
-t