The most expensive fan is like 11 bucks...

https://www.svc.com/80vanthertem.html


Get that!! Make it blow INTO your PSU. And, this is VERY important. DO NOT TOUCH ANYTHING IN YOUR POWER SUPPLY. Im talking you getting electricuted and dieing bud. The tansisters in it can hold ALOT of juice for a long time. DO NOT touch anythign in there!