I bought a plasma cutter and a GPU. In the past I would get used GPU from eBay because it's cheaper but the demand for them has made the market a little crazy and there's very little price difference new vs used (UK). The price performance sweet spot seems to be AMD 9070xt (£550, ouch).

The plasma cutter is an old three phase machine that no one wanted because it's 400V. However, looking at the circuit diagram there's very little difference between single and 3-phase configuration so the plan is to convert it to a domestic supply or cannibalise the internals and torch assembly.