So, in about 4 hours I'm going to possibly purchase this lens. http://lasvegas.craigslist.org/pho/3499283088.html My only concern is why he is selling so cheap? Is there a way I can check if its grey market or anything like that? This would be my first L lens so not sure what to look for/expect. I'll be taking my T2i, and laptop along to try it before handing over my cash.