they do come up on ebay from time to time.
just have to keep doing a search.
i had been looking for a good size one for a while.
and they seems to be in the £200 price range.
then i found one, one day for £35 in ipswitch.
needed some TLC, unused and was full of surface rust.
but ive taken it all apart. and ready to be sand blasted.
just hadnt got around to carrying on with it yet lol
other things get in the way....
just keep doing searches on ebay, gumtree, preloved. etc.