I say go with your gut....do not undersell them...you can always go lower, if you get a "feeling" by listening to the talk at the table when people come by. You can always lower it a bit, but cannot raise the prices while at the table...I am making some things for a craft show in October and I am having the same problem, with pricing....don't want to under sell, but I have been working on things since March. And have been putting a lot of time in on it....Good luck in your sale, hope you sell everything!!!!!