Well, I was looking for a window fan.
But my old Ready Heater took a dump.
So I cut it up, put a switch on it and a remote (from Christmas Lights) put in on the counter for an exaust fan, right up to the window.
Before that I bought a Home Depot stove vent fan put it in cardboard and then in the window (that was about $20.00).
Don't forget you also need an open window somewhere else to let fresh air in as you get rid of the bad air.
$120.00 is too much for me.
Hope this helps.
Mark