Sorry to say it, but the Urbana Farmers Market is overpriced. I cannot imagine spending $3.00 a pound for string beans, for example. Tomatoes are also priced at $3.00 a pound even when the vendors' tables groan with them in August. New York's Union Square greenmarket is cheaper! Of course there's that airfare...
I go once in a while to buy zucchini, onions, and garlic and to get tomatoes from vendors who sell the ones with blemishes for $2.00 a pound or less. If you poke around you can find some bargains, but this is the most expensive farmers market I've ever been to unfortunately.