We used to do craft shows several years ago. It really depends on the venue. Some places we did really well others not so much. $50 to $100 was average cost for a 10x10 space. We finally gave up on the craft shows because people don't want to pay for your time. Then we just did art shows. We were selling woodworking items - everything from pens to clocks to intarsia (pictures made from different woods).