CPO Commerce via eBay offers the refurbished Generac iX2000 2,000-watt Portable Inverter Generator, model no. 6719, for $349.99 with free shipping. That's $180 under the lowest total price we could find for a new one. It features a 12-volt DC outlet, fuel-saving mode, low-oil shutdown, push-button start, and LED indicator.
A 90-day warranty applies, but it's unclear who backs it.