Here is what you seek. Stay thirsty my friends, Cheers.
http://powertank.com/products/sfID1/37/productID/419
Also can not wait till my presidential brew is ready for downing. :)
I live in Georgia and $25 for a 5lb tank is usually standard also a fill and a swap are the same thing except you get some one else co2 tank. If they fill your 5lb tank the co2 tank they are filling it with has a dip tube so you get liquid not pressure.
if you go to a welding shop you think they have food grade co2. If your not buying food grade there's no telling what your drinking. My brother works for a gas company and i ask him whats the difference and he told me the food grade has been filtered to remove all the harmfull gases and oils...