I believe you can leave comments on your feedback, but I know that hardly makes up for idiots like this. Maybe ebay can help you out with it.

Sometimes you can get some good buyers and sellers. I sold a server to someone who was extremely patient despite several delays that were partly my fault.

Sadly, ebay is simply the last recourse for some items. If I could have gone to a store and paid $120 for that LP I bought, I would have. It just so happens that ebay had the only one around