Back in the days when the Bosch/Scintilla drill motors used (metric) 0.7 module gears, we used to order the mating gears from
PIC Design. They had some issues with promptly shipping orders (probably because the gears we wanted were non-stock), but the parts were always of good quality.
They sell 303 stainless steel and 2024-T3 aluminum gears in smaller Imperial pitches and metric modules (24 DP, 32 DP, 0.8 module, 0.7 module, 0.5 module, etc.).
They also have a good (but expensive) selection of high-precision bearings (FIRST robots aren't likely to benefit from anything beyond ABEC-3, and ABEC-1 is more than sufficient for many jobs).