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Not as cheap as second hand, but pretty reasonably priced and a good range of sizes in 232 or 300 bar:
http://www.gasbottlesdirect.com/category/steel-scuba-tanks-300-bar/-4---8-l/14
I've got a couple of good condition 300 bar 7 litre cylinders looking for a new home. They are full of air, passed a hydro in July 2019 and haven't been used since then. £150 for the pair (and they come with a double boot in case you want to dive them as twindies). They're in Cardiff, buyer arranges collection but I may be able to assist with getting them to a caving club in the S.Wales area.
Cheers,
M
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