In2deep Look in Yellow pages under "welding supply" or industrial gas. Get the best price and make sure you get a good bill of sale receipt. A lot of refill places are getting finicky about what they will swap out and want to know where you got the bottle. Once you establish yourself at the local refill store once or twice they never ask again. I agree with Cletis that the 80 cubic sizes saves a lot of trips....


Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
Things may come to those who wait...but only the things left by those who hustle."-Abraham Lincoln