Duh. Why not look at the tanks? One of mine had a sticker for this place which still needs to be shipped out to Ohio but they guarantee that they'll be returned within 2 days of receiving them and it costs like $25 once you figure in shipping and valve removal.
http://aquahuthydro.com/Furthermore I had another thought. Someone I work with goes scuba diving so I can ask for info and see what direction that takes me.