If u went thru paypal, then complain to paypal, they will actually support the buyer sometimes, and can step in to take money from the bank account or even cc of the seller.
But amount is so small, Im not convinced they will do anything.
Check ou the links for help http://www.ebayexodus.com/
U might get some pointers on what to do about your situation. Good luck, and dont get worked up over a few dollars