it is no longer possible to buy Bernzomatic oxygen canisters in
the UK, which is a shame as that is what I converted my Hoke torch
to run on. Getting a proper O2 bottle is not really an option due
to BOC's exorbitant bottle rental and delivery charges, and
realistically I do not use enough.
I'm not aquatinted with the economies & rules regarding the sale &
use of pressurized gas in other than the US. However, if you do a
reasonable amount of work requiring the use of a fuel/oxy flame,
you might look into the water torch as a possible solution. It
breaks down water into hydrogen & oxygen through the use of
electrolysis. The initial cost can be a bit high, but you'll not
have to buy fuel gas or oxy again.
Another solution may be the use of an oxy concentrator. In the US
the medical profession sometimes prescribes oxygen to assist folks
who have breathing problems. One of the ways the oxy is provided is
by an electric powered machine that concentrates the oxy in the air
for breathing. These machines are sometimes available 'used' after
the initial user has gone on to a better life.