This 143:1 gear motor is much like the GM3 gear motor but runs at nearly twice the speed. Great for robots needing speed over torque!
A bit slower than the GM13, but less current consumption. Less expensive, too!
The Planetary Gearset kit from Tamiya gives you a huge selection of ratios in one package
Much like the GM11-14 series of gear motors, but with a larger motor!
The MCM2 is a collection of high-quality precision parts in a cassette mechanism with 2 motors ideal for BEAM hacking.