$99 AC At Lowes -- 5000 BTU/Hour.
http://tiny.cc/h7i2b

This is only $1 more than the cheapest one I saw on the WalMart website, which wasn't available in stores. I'd seen that exact model linked above in two separate Lowes recently.

$99 AC at Home Despot -- 5000 BTU/Hour
http://tiny.cc/dyrw1

Similar to the one at Lowes.

Any other big box store I looked up either had the AC's atleast $10 more, or didn't have them in-store.

5000 BTU is exactly the right size for cooling down a small-moderate sized bedroom. (though only that)

Also, don't forget the taxes and fees you will incur at a hotel. Hotel pricing is deceiving.