A google isn't helping me at the moment...

Anyone know of anyone who sells small, quiet drum (squirrel cage) fans? Approx 40mm x 40mm x 100mm. This is related to my CPU temp experiments. I need to get more cool air into the case because the CPU fan is just recirculating hot air inside the case. Although there is a mounting point for an 80mm round case fan, it's nowhere near the CPU and is in an odd position on the case where it wouldn't really get the opportunity to move that much air (either in or out). Much better would be a squirrel cage over a rectangular opening I've got on the back of the case very close to the CPU. But all the PC fan makers seem to sell is the 80mm round fans.