Ebay usually has a couple listed and sometimes they are advertised as refurbished but worth checking that does not just mean a coat of shiny paint, an oil change can cost a few quid to do.
Great machines though, always regret selling mine years ago.
Most are dual voltage so no worries there you'd be pushing the boat out to try and find a 225amp - 300amp single phase though, you might find a 180amp one prices vary alot dependant on the leads and if they come with the welder. Without you be looking at buying an 180amp one for about £75-£100, although some do sell for silly money on ebay, there was one last week for £450
you can get them but you need to keep looking, this one went for £59 and complete with leads
if you get a long set of leads say 25 to 30ft then look at paying around another £100, you can buy 35mm welding cable on ebay from £4.99 upwards per metre