I've had good luck on e-bay. Bought both of my fantastic fans from there. One BV8100 for 56.34 (including shipping), and a Create-A-Breeze 8000 for 84.99+19shipping.
So your price for the 8000 is decent. Although, the 8100 was a much nicer fan. electric up/down, and continuously variable fan speed.
If you're looking on ebay, FanasticVent has a
file that lists the features of all the 46 different models that they offer OEMs. Since most of the fans on ebay are pulls from RVs, you can check that file to see what a specific model offers.
Oh, and if you buy a used one, just email FantasticVent and they'll send you a new interior trim piece.