Anybody know anything about gear motors and where to search for them?

I've been tasked with finding gear motors to replace a model that we use. If I'm looking for something exact, I can usually find what I need, but if I have a margin of error for what I need, it gets harder to find what I want.

As an example, I need a right angle gear motor running at 90vdc. Fine so far. But I can use anything around 1/7 to 1/10 HP, and approximately 90 RPM with a decent margin of error both ways.

We don't care where it comes from, but I don't even know where to look.