Selling this Haier window A/C: http://www.target.com/p/haier-5-000-btu-mechanical-window-air-conditioner/-/A-12212394

I used it last spring in a pretty large (and hellishly hot) room and it did the job pretty well. It's loud so I usually kept it on during the day and just used a fan at night.

$50. There are some minor dents in the back (see picture) that don't affect functionality. Window brackets are installed, although you'll probably need some screws if you want to mount it.