I just bought a Lincoln SP-175+ off Ebay used. The welder is in great shape and has all of the accessories. I have bought a HF mask and already wired the outlet on the shop. I just need wire and gas. I figure Airgas is the place to buy both. Which is better, to buy my own cylinder or lease one from them? I can buy one for $150 from IOC shipped. I have no idea on lease cost. School me.