ive got a mig gas welder (gas and gasless), im looking to use it too weld some car panel, i can get hobbyweld 5 (93% Argon, 5% Carbon Dioxide and 2% Oxygen) which is £29.99 and cylinder deposit is £50.00, is this a good deal? no mention of what size it is but its not the shitty little desposable's.

 

I have a hobbyweld 5% mix bottle, its cheaper than disposables, but if you are a heavy user will need a 200bar filled bottle, I was told if I need more than 2 bottles a year its worth going to a bigger bottle, but think this will be most cost effective for me as unlikely to use more than that. At least if you decide to change you get the deposit back, bottle is similar size to pub co2 bottle.