Start by looking at the selling feedback for the seller. Likely some simple reason, like he has included most of the shipping in the starting price. Scammers usually have 100% feedback rating for small purchases, then launch into a big fraud – and run before epay catches up with them.
Reading the auction details very carefully should protect any purchaser – and pay by paypal, so you can get your money refunded if it all goes bellypup. Buyer beware is the usual warning for any epay deal.