I won this Super Mario World sign today

http://cgi.ebay.com/ws/eBayISAPI.dll...MEWA%3AIT&rd=1

About 3 hours after I won, the guy refunds my money and emails me, saying he didn't mean to list this particular item and that it was all a big mistake. Here's the email he sent me:

Sorry, but I made an error in listing this. The wrong item was listed. Sorry for
any troubles, I will still leave positive feedback for you if you'll do the same
for me

What should I do? I really want this item...and it doesn't look to me at all like he accidently listed it. I think he didn't get nearly as much money as he thought he would and now he's trying to call the whole thing off. Any suggestions about what I should do? I've never had a seller back out of an auction on me before.