Hi Dodger (I think you sold me a 7 litre cylinder a couple of yrs ago).
I have not bought a similar sized CF wrap air tank, but I did buy a 0.36 litre CF wrap bottle for my Airwolf on aliexpress for ~£100. It's very good.
While I was researching this, I saw quite a few 2.6 litre (IIRC) and larger, CF bottles