Shamrock: Did you happen to use Paypal?? I had a similar incident awhile back. I ordered two Fiamm Horns with the wiring relay kit. When they arrived they were Flosser 3.5 inch horns GALVANIZED. Boy was I hot. I first wrote them that they were the wrong horns, and definetely not going on my bike. I refused to pay to ship them back. I then get a email from them saying they had a stock change, and hadn't had time to update the auctions. Send them back, and they would refund my money plus the shipping back through paypal.
I started getting a little hot when two weeks later still no money, and they had got the package back via USPS confirmation tracking. Well, I was then informed they only refund two times a month.
Finally around the end of the month the reversal came back to my account to paypal.

Ebay looks the otherway on what they use to call a "PRE-Sale" clause which was only available back in 2000 between a manufacturer direct sale to the public. Now ebay looks the other way and lets the sellers do exactly what they did to you. Take your order, and then wait for the stock to come in. If they don't deliver with in thirty days you can report them to the Attorney Generals office in your state, and the sellers state. I am sure you left them a negative already??