I coincidentally ordered a used one from GameFly earlier this week and just received it. The copy I received was the Limited Edition with the code included (I haven't used it yet, but I assume it is still good).
I've been a lurker for a few months, and thought I would give back to the community. I haven't see this posted elsewhere, on Walmart.com they currently have a Fathers Day sale for 2 for $15 on any of the following Blu-Ray movies (online only):
Gran Torino
Departed
Whiteout
Invincible
King...