Well, think again.
The bottles have a 10-year life on them, after which they cannot be re-filled.
We went to a hardware/garden centre and the gas bottles were three years old. We went on to a leading department store and picked up three bottles.
One was four years and the others two and three years old respectively.
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READ NOWNext we went to a camping shop, where again the bottles were two or three years into their life.
We ended up at another hardware store. That was better with bottles only one year old.
I think there should be a varied discount on gas bottles according to how many of their years of life have expired.