What's the best distributor for stock gears?

I need some gears and I have a bunch from CD players and things, but the ones I need require more specific ratios than I can get with found stuff. Does anyone know a good distributor of stock gears with a wide selection? (I ask because I don't want the cost of custom-making them if I can get a good selection AND a good deal) I am based in the US, but any international ones would work if there are none here or if any folk across the pond need some.

ewilhelm8 years ago
I've ordered all my gears from McMaster, Small Parts, or a distributor called, I think, SPI-DI or some similar letter combination that I can't figure out with 5 minutes of web searching. Obviously, their branding wasn't very good.
ewilhelm8 years ago
I finally remembered: http://sdp-si.com/