VM Innovations via eBay offers the Lifesmart 5,000 BTU Window Air Conditioner, model no. LS-WAC5, for $89.99 with free shipping. That's the lowest total price we could find by $20. It cools rooms up to 150 sq. ft., includes a window mounting kit, and features three cool settings, three fan speeds, and a multi-directional vent.

Also available is the Lifesmart 6,000 BTU Window Air Conditioner, model no. LS-WAC6R, for $99.99 with free shipping. That's $200 off list and the lowest total price we could find. It cools rooms up to 260 sq. ft., includes a window mounting kit and remote control, and otherwise features the same specs as the above model.