I would definitely question its authenticity as well if it's ever sold for this low even preowned. You can find some deals on ebay or consignment shops, but if you do find one, please post the pics on the athentication thread here on the forum before you buy it. There are many experts here to help you. Make sure you get it authenticated here, its very helpful and will save you a lot of grief and heartache. Also please refer to the list of reputable resellers on tpf if you choose to go with resellers on ebay. Do not purchase it before you get it authenticated!
If I were you, i would be patient (umm, tougher than it sounds) and save up a little more and buy it from the H store or reputable reseller for a piece of mind. I wouldn't take the risk! This is an investment, so its wiser to use your head and not just your emotions in purchasing this item which you'll keep for a long time.