Complete BCM Blem Lowers are about $299, G and R Tactical or Primary Arms. Picked one up a month or so ago, it's got a decent mil-spec trigger and I can't find the "blem."
I also just order an LMT (without the SOPMOD stock) for $329 through my local FFL dealer, and I thought that was a great price for it. I have a a complete LMT and love that rifle.
A lot of people say that Lower's don't matter as much as the Uppers, but for me, it was worth it. So I may be a fan boy, but I'm okay with it. Do you research, lot's of threads out there.
ETA: Riflegear has the A2 Lower for sale, but I found a better price by going directly through my dealer. If your dealer can't get it through LMT Direct maybe check Gunbroker, or call up Tombstone Tactical and see if they can grab one.