If one of you can post the part number of the fan I'll see if I can dig them up for you, I replaced a couple a few months back and they ended up being ~8$ each, but could have been cheaper since I paid a premium to a middleman.
"First D" FD9225U12S
0.48 Amp, 12v.
Here's a sketched up photo, sorry for the blurry-iphone-closeup-picture-crappiness. And the toddler level red-crayon markup.
http://dl.dropbox.com/u/32375118/Fan_FD9225U12s-ScaledDown.JPG