You may have to sign up with NFAtalk.org, but this FFL is selling these
http://nfatalk.org/forum/showthread.php?t=7199
PHP:
new AR15 Bolt Carrier groups in stock ready to ship.They are complete BCGs ready to drop in and go. Bolts have been MPI tested (stamped MPI), Manganese Phosphate finish, Gas Key has been staked, Carriers are Full Auto, machined to US Gov. MIL Specs.
$115 Delivered
http://nfatalk.org/forum/showthread.php?t=7199