Agreed. However, unless you get lucky and catch one on sale, a 6,000 BTU unit is around $100, or they are around here.

I borrowed one from a friend a year ago when my central air conditioning died in the middle of July. It did not make the house cool, but it did make the main living area fairly comfortable. It made the difference between miserable and just inconvenienced.

If you plan on using the A/C quite a bit, then get the highest EER that you can find, even if it means spending an extra $40 or so. They also come with all of the extra accordion-panels and stuff to mount it in a window without looking too bad.