I decided to build my own, needless to say, for much cheaper.
What you will need (and probably have lying around):
- old desktop DVD player or something similar with a metal housing that fits under your laptop
- smaller CPU fan
- some usb cable (can be anything, we only need the plug)
- electrical tape, glue, solder
- small metal saw (or dremel if you are into that kind of thing)
- soldering iron
- knife, screwdriver
Step 1: Remove the guts
Step 2: Cut a hole for the fan
After cutting the hole I instantly managed to cut my finger with the edge... but it gave me an idea. I stripped some of the power cord and glued the isulation around the edge. This will keep the fan in place and it wont scratch the bottom of my laptop.
Step 3: Wiring
Note: the USB port has only 5V at 500 milliamps... tha fan needs 12... the reason why this works is probably because the USB ports are prepaired for anything, but be careful not to short them. So far it didn't fry my motherboard.