Okay, I'll jump in here since 68 people have read this with no replies.
What about belts? I'm thinking of those scarf-like ones, about 3-4 inches wide and long enough to tie in a knot in the front. Probably each would take at most a quarter yard of fabric if it was double sided, and the lenghth would be the width of the fabric. You could pick up some remnants or use what you have on hand. Here's an example: http://www.mydivascloset.com/scbein4cofor.html
You could also do ribbon belts, but you'd have to buy ribbon and D-rings. http://ecubedarts.blogspot.com/2006/01/belts.html
Not sure what else would stay at/under $10, maybe some really simple market bags out of canvas? You could have plain ones in the $10 range and decorated ones for more. http://secure.mcc.org/mccstore/index.php?main_page=index&cPath=2
Maybe felted purses? Small ones, or felted change purses? I'm really not sure what your market demographics are...we sell jewelry at our farmer's market, and it's worked okay for us. Our best seller is $5 necklaces that are a large stone donut ($1.50 at the rock store in town) put onto a faux-leather thong. Takes seconds to make costs us $1.55, sells like crazy. I don't know if that helps you any. We did sell a surprising amount of things, especially at the end of the market in Sept/Oct (people thinking ahead to Christmas?)