wrote:
Otherwise, the best window fan I know of that is still being produced
is the Air King 9166D. It's not cheap, though: $249.99 at Amazon.com.

From www.froogle.com, these guys sell it for $180.
http://secure.data-comm.com/RB/Detail.bok?no=146912

The Air King 9600 (16 inch) sells for $88.
http://www.air-conditioner-home.com/product/9600.aspx

Just as a point of reference, I've done the bolting a
20" box fan in a window and it seems to work just fine.
I used a piece of cardboard with a circle cut out to fill
in the rest of the open window. The only drawbacks are
that it doesn't reverse and there is no thermostat.

Anthony