I buy almost all the stuff I need on eBay and bought an LM sometime ago also on ebay, but from a different seller. I just saw that this particular seller (gracooler) has had over 1861 positive feedback received, that means he or she has had that many satisfied customers and that's a pretty good score, it gives you a fair idea if the guy's on the level. But for the last 6-12 months he or she has a couple of negative feedbacks as well, a few disgruntled customers as it were.
I would suggest emailing them and asking for actual pics of the item you wish to buy, they're using stock pics and that always seems kinda suspicious to me. You might also wanna ask for their business address. It might be close enough for you to see the item(s) personally.
I agree that it does seem like a pretty sweet deal. Then again, there are still some sellers out there that will try to dupe you. Remember the rule, if it's too good to be true, then it probably isn't.
Hope this helps, good luck!