Newegg offers the refurbished Haier 13,500-BTU Portable 3-Speed Air Conditioner with Heater
with free shipping
. That's $82 below our mention of a new unit from last month and the lowest price we've seen. (It's $82 under the best deal for a new unit now, although most retailers charge $480 or more.) It features a remote control, digital display, timer, and dehumidifier.
Note: A 90-day warranty is included but it's not clear who backs it.