I bought my upper from this guy on Craigslist. While I am not vouching for the guy in any way I did meet him face to face to make the transaction and he seems like a genuine guy just looking to sell some parts. I think he does this on the side to make some extra cash. I have no idea if he would ship the item but if you are interested I guess the worst you could do is ask.
AGAIN, the guy seemed really cool and we talked about all the sh*t going down with a possible AWB and the terrible weapons restrictions they have where he lives in MD but I am not vouching for him - I met him once. He may entertain offers, I bought for less than what he is asking for these - best thing is they come with a BCG and CH.
Here are the listings:
RRA Upper/A2: LINK
Red X Arms Upper, Free Floating: LINK