eBay search for laser engraver and you'll find units in the $600 range. They use CO2 lasers and seem to do ok, though you'll typically find yourself laser etch

eBay search for laser engraver and you'll find units in the $600 range. They use CO2 lasers and seem to do ok, though you'll typically find yourself laser etching a painted surface off stainless rather than engraving the stainless itself. Most people don't mean engrave when they say engrave, though if you really want to remove hundreds of microns of thickness, you'll have to spend far more.