Brian,
Most of them will give you the tank full for like $10-15 and then they just charge you to refill it, which is only about $10, and unless you have a huge tank, you should only have to refill it, at most, 4 times a year. Probably only 2 times a year. I'm sure they'll have the valve too, but Larry's valve may be better. I'm not sure about that.
FOX
------------------
angelfire.com/ak3/korysreef.htm