What about these new fans over at bgmicro.com:
new products
80x80x25mm, 12Vdc/100mA fan by Aavid Thermalloy. Dual ball bearing, 2000RPM, 27.80CFM, 25dB-A, 7 blades, 12" red and black wires. UL, C-UL, CSA, TUV approved.
FAN1054.....$2.99 or 10/$22.50
80x80x25mm, 12Vdc/120mA fan by Aavid Thermalloy. Dual ball bearing, 2500RPM, 32.40CFM, 27dB-A, 7 blades, 12" red and black wires. UL, C-UL, CSA, TUV approved.
FAN1055.....$2.99 or 10/$22.50
80x80x25mm, 12Vdc/120mA fan by Aavid Thermalloy. Dual ball bearing, 3000RPM, 39.50CFM, 29dB-A, 7 blades, 12" red and black wires. UL, C-UL, CSA, TUV approved.
FAN1056.....$2.99 or 10/$22.50
That first one sounds pretty quiet but I don't know about the quality...