http://www.xtreme-tactics.com uses them as rentals. Email Gord (the owner) there....he may have a few for sale in the pro shop.
FYI I have used these....they're not bad, but you can't see shit at dusk/night, and they fit really bad, although they can be easily modified for fat Western Hemisphere heads. The strap is tiny - like 1/8" wide - and should be replaced. Also, the metal mesh tends to "shatter" brittle bb's (like Hurricane brand), you you may get "powder" or bb dust in the eyes from time to time. Granted, my experience with these has been at close range (CQB), I'd imagine they'd fare much better outside and at longer engagement distances.