Old thread but I thought I would update. Beer Necessities charges $32 for a 10# refill while Beverage Control only charges $11. Its worth driving out of my way to save $21 especially since it's just once a year.
I fill my home soda maker (20oz same as paintball) from Ga Paintball (Kennesaw). While you wait. Nice guys, cool toys...drinking AND guns. Lol.
I've been drinking their gas for over a year with no ill effects.
And since I'm only making fizzy water, I notice NO strange tastes that I can attribute to the gas.
Paintball tanks are $5 but their prices are scaleable so give them a call.