I stumbled across these last night while looking for a fan.
There’s two different Mainstays brand 20" 360 floor fans currently on clearance.
The 3-blade model is $11 at some stores (originally $39.27):
https://brickseek.com/walmart-inv…=84663495
The 5-blade model is $13 (originally $49.82):
https://brickseek.com/walmart-inv…=74617601
It’s Walmart, so every store is priced differently, but I did pick up one for $11 so I can confirm the accuracy.
http://www.walmart.com/ip/Mainsta…/846634950