I just came home with a 5X7 coated nylon tarp from wallyworld for just under $10.00. Wieghs 8.1oz, 8.9 oz with stuff sack. Has grommets for hanging from trees or what not. If saving a couple of ounces isn't importent, but saving 50 or more bucks is, then this is a great deal.

Actually, Walmart is starting to have a fairly decent selection of camping odds and ends for cheap. With the exception of a sleeping bag, you could outfit yourself reasonably well there for not much money.