Does anyone know where to buy cheap 25mmx25mmx10mm fans? 

Does anyone know where to buy cheap 25mmx25mmx10mm fans?

In South-Africa yes, but not sure where you are, elaborating may help.

U.S., I’ve gone through AliExpress and eBay. I just want to expand my sources.

eBay and AliExpress are what I know for finding cheap sellers. Digikey and Mouser should have them, and very likely higher quality ones, but I’m sure they’re more expensive.