Walmart offers the General Electric 5,050 BTU Window Air Conditioner, model no. AET05LQ, for $99.84 with free shipping. That's tied with our mention from a week ago as the lowest total price we've seen for a shipped unit. (It's a current price low by $37.) It features a 2-speed fan, slide-out filter, and is suitable for rooms from 100 square feet to 150 square feet. It includes an EZ-mount window installation kit.