For the Papst 120 and 92mm:
visit
www.ebm.com try calling them up i've heard you can buy from the directly, i remember someone has before, or they will refer you to someone you can in the US.
Lemme know if you can find those Nidec fans espically the Nidec M34720.
--Theres another Papst 120mm fan you might be interested that i haven't put on that page yet, its more in the quieter range of dB:
Papst 4312MV - 22dB / 41.2cfm or @ 39dB / 82.4cfm
its a varible fan that changes speeds depending on the temprature, it has 3 wires coming out of its not data wire, but i think if you build a switch between these 2 postive wires, you can control the speed not depending on what temp it is, which would be very useful. Im gonna buy one pretty soon and play with it. 22dB is damn nice for a 120mm fan..its gonna be really low pitched, probably that sound is only generated by the moving air.
Let me know how this goes
GiZzO's Fan Page