cheap fans for grow cabs

i went to bestbuy and found these for 10$. its a laptop cooling pad that has 3 built in fans. wired and everything. disassembled it is perfect for small grow cabs, pc boxes.. etc

You can buy regular computer case cooling fans and a 12 volt adapter and and work with the sizes and CFM you are looking for. All of the laptop cooling pads I've seen are powered via the USB port.

if you're good with a pc, you can program your computer to be your timer.