First and most important, don't go beating yourself up about not using another form of payment. It just dosn't help, if nothing else consider it a lesson learned and hell, college costs more then that... * Well I think so, never been..well once but that was for lunch and there was this young lady, oh nevermind*...
What's there feedback ? What I would consider is opening a case asap with eBay. On your My Ebay page, I believe it is the last selection on the left hand side Menu.
Dispute Console , it dosn't have to be a threat per say. It gives you a few options and if the seller is on the up and up they will straighten out the mess and no harm to them.
But either way this serves a step towards protecting you and hopefully ensuring the arrival of your item's or money returned. If this person is seller, trust me the last thing they want is Ebay hassling them, tying up there money.
Not saying it's the best advice, but it's what I would consider..*then again there was the college thing, so maybe you shouldn't listen*
Good Luck
not dead