To the best of my knowledge, these are only presently available via private sale from a first run done by the folks at BPMC.

 I understand that they should become widely available some-time mid-to-late October.

https://bitcointalk.org/index.php?topic=292433.0 :: KevinM has some available for sale in batches of 5 @ 1.4 BTC each.
https://bitcointalk.org/index.php?topic=299295.0 :: Thread on upcoming batch