what we talking big / small? dc (not aloys) or ac/dc (everyhing)?
you may find a reasonable make s/h (240v) dc unit (avoid scratch start units) but your going to be pushed to find anything half decent s/h ac/dc for sub £500
also you want to x2 your amps in ac so dont even think of anything sub 200amp (min 16amp supply on 240v)
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