There are some from RO Mate that if you are looking for long life that would work. Also with the RO Mate can have the main part replaced if needed down the line.
Did that 15 years ago at a company that I was working for.. 20 minutes and 95.00 later that tank was fixed and back on line again.
RO Mate is not cheap, but very long lasting.
or look for a plastic pressure tank and not the metal tank.