there are several harbor freight locations in and near phoenix, and i think oxygen tanks can also be rented there. this regulator is a bit more expensive than one bought on ebay (about $10-$15 more), but the advantage of getting and using it right away might very well be worth those extra bucks. as i remember from postings here by other folks, this regulator doesn't have a specific lpm gauge, but can be adjusted just based on consistently filling the bag attached to the mask. please correct me, racer (or anyone), if i'm wrong about any of this -- want to be sure christina is as fully informed and prepared as possible. do you recall whether you also need to have/buy a big wrench in order to fully tighten it?
You are correct......and yes, a large wrench is needed for tighten the reg to the tank.