Not being snarky at all. If you don't want to spend the coin on something that is new, that's your choice. If you don't want to spend half price of new, but take the gamble, again, your choice.
Other than the stuff at PA (I don't trust that crap), Kijiji (roll the dice), or going new (it works, with a warranty!!), your options are really limited.
A better way would have been saying.... "I'm looking for a place that sells HVAC surplus parts. Specifically, I want a 115 V furnace blower fan and squirrel cage to hack into a garage exhaust setup. I am looking at spending $0.02. Can anyone point me in the right direction?"
$150 for a blower IS over priced, but I am sure that if it was on kijiji, there would be some wiggle room.
$150 will get you a whole BRAND NEW motor/housing/fan.
Food for thought.