Help!! Urgent!! Ventilation problem!!

I need to find some really quiet, but pretty powerful fans.

The temp in my cab is at 101 when the door is shut so I definitely need more air moving in and out.

I dont have enough money for an inline fan, just one that can be powered off of a 12V DC power supply.

please help!!!

get a bunch of computer fans. I cut 6 holes in the floor of my cab and hooked up 6 cpu fans. Took the temp down from 117 to 109. Had to get a 6" inline 530cfm fan to take it down to 90 degrees. Still have to keep the door cracked to have the temp at about 80. Thought about cutting holes in one side of the cab and putting some more cpu fans to try and draw more open air in but havent gotten around to it yet. The fans are very quite and pretty cheap too. Ive seen a couple links around here for some powerful cpu fans but their about $20-25. You can get on craigslist or ebay and find a lot of 10 used fans for about $20.