Does anyone have ideas on how to save a few quid on co2 welding gas, i seem to be getting through a small fortune doing the welding needed for my 300 tdi. Currently using disposable bottles from b and q £11 a pop and there only lasting half a day, rang BOC in exeter today and s*ate myself with the price of the hire of the bottle, refill charge and "other costs" live in exmouth and need a cheaper alternative