I've check postage to send it back, actually a dollar more than the item cost.

I think a big problem with eBay /Paypal is the requirement to return a item, I can understand where the right item has been sent and the buyer changes his mind, but why should the buyer wear the cost of a seller  sending the wrong item??

I think not, I think Ebay and Paypal need to make the seller aware if they send the wrong item, they have a responsibility to remedy the problem , not the buyer.