In the past couple of years, the role of electronics, and especially stepper motors, has increased dramatically. The modern ATM is often a computer user who controls the telescope with a computer, or other electronic drive system. To that end, the ATM Resource List has been expanded to include more electronics dealers.
Stepper motors are often available cheap or free from various sources.
Good source for stepper motors and drive electronics. HeNe laser tubes, power supplies, vacuum tubes, logic and linear integrated circuits. Has carried copier lenses for finder scopes, heat ropes for dew-removal, and lots of weird stuff. Brass and other tubing. Electronics, stepper motors, power supplies.