For years now when I needed some Gas for my 150 Mig Welder I would buy disposable cylinders. However after doing my homework for buying gas in my area the deal that suited me best was Hobby/Weld. I drove about 4 Miles to the shop and paid the guy £60 for the 9l Bottle plus £30 for the gas Hobbyweld 15 plus another £30 for a Regulator..The guy at the shop said the 15 gas was a little bit better than the 5 for me being a Hobby user.He also said the 15 Gas would be better for my welding. I will see..