Hey TurdBurglar:
I've got your exact same issue on a TI 4200 by evga. The fan went out and I didn't want to spent lots of money on it. Here's what I did to save some money...
I got 2 PCI slot covers and I got a 92mm (you can get an 80mm fan if you want to) and I used epoxy to mount the fan onto one of the PCI slot covers. I wanted 2 days for the epoxy to completely dry. After the fan was dried on the slot cover, I used the epoxy to glue the second PCI slot cover to the first one w/ the fan on it. It's hard to show you how it's done but you'll see which way you need to mount the fan and slot cover once you start the process. Essentially, the end result is a home-made vga cooler that is more than adaquate to cool that GPU and is quiet (because epoxy acts like an insulator) and it's practically free!
One word of caution: Make sure you double check the clarence of your PCI bus. My fan was barely not touching the PCI bus and if you use an 80mm fan, you should have enough clarence to be ok.
Hope this helps.
TTFN