I ordered a few from EBAirsoft.com(Link:
http://www.ebairsoft.com/magpul-pmag...cs-p-1643.html), but before I say more, I should state that I think they might be clones. The reason I believe that is the fonts they've used for all of the lettering looks a lot like a font you'd see on a cheap chinese clone/toy, they have a space in the body where the maglevel window would be(exactly the same as the ACM hicap clone), not to mention they only cost me $40 for a pack of five(this is purely speculation, if someone knows otherwise feel free to correct me).
I have to say, I'm impressed. They fit nice, and are really durable. They also hold 30 rounds, which is a bonus for all of the realism buffs and race shooters out there.
If you can get them, go for it!