I just ordered some precision gears from a place called Rino Mechanical Components. The precision gears that usually take 3 weeks or 6-8 weeks from Berg or SDP can be delivered in less than a week from these guys (at least that is what they told me today).
Also, they are reasonably priced.
The only catch is that their minimum order quantity is 10... but they seemed flexible, letting me slide with ordering 8 of one gear.
Rino Mechanical
I warned the salesmen that I would be recommending them as a good supplier... so if you use them, hopefully they will treat you the same.
Looking at their catolog, these guys also sell other mechanical components (couplings, gearboxes, etc.).
Enjoy,
Andy B.