Sources for nitrous oxide in AZ?

[nikwho]

Hello all,
I've got my new nitrous oxide system (Nitrous Express Mainline 1000) all plumbed and ready to go. I've got it set up on a WOT switch, that's also connected to my MSD Digital 6+ ignition box. Anyway, I'm looking to get a bottle filled and having a really hard time finding a shop that can fill it. I live in Flagstaff, which has nothing. I've also looked in Phoenix and Kingman with no luck. Anyone have a source?

Thanks,
Nik