Home Depot offers the Lotos 200-amp AC/DC TIG Welder with Foot Pedal, model no. TIG200, for $549 with free shipping. (Amazon charges the same.) That's the best deal today by $271 and the lowest total price we've seen. Features include a square-wave inverter, maximum welding thickness of 1/4", 220-volt to 110-volt adapter plug, HF start hand torch control, and foot pedal welding heat control. It comes with a welding protection mask and TIG accessories kit. Deal ends March 29.