[RWebb]

Here is one link:

Quiet Computer Fans - Quiet PC Fans - AcousticPC.com

Newegg has this for only $17:
Newegg.com - Scythe S-FLEX SFF21E 120mm Case Fan

a review:
Noise Shootout of 80mm Case Fans-Best Computer Online Store Houston Buy Discount Prices Texas-Directron.com


they all have to flow enuff air to accomplish adequate cooling in the PC case, of course