Powerland via eBay offers its Powerland 600-watt Portable Generator / 100-amp Arc Welder, model no. PDW100, for $479.99 with free shipping. That's the lowest total price we could find by $219. It features a 6.5-horsepower 4-stroke gasoline engine, fully-enclosed case, 50- to 100-amp DC welding current, and up to 600 watts of AC output.