An Arduino can be used to put things in motion, here you'll find stepper motors and servos
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Motor driver shield L293D $ 4.93
1x SG90 Tower Pro Servo $ 9.59
6x SG90 Tower Pro Servo $ 17.06
1x SG90 Tower Pro Servo $ 4.76
Stepper motor with ULN2003 driver $ 4.60
28YBJ-48 stepper motor $ 3.48
28YBJ-48 driver $ 3.17
5x Mini Motor 3V $ 6.33
75x gear kit $ 11.41
75x pully/gear kit $ 13.94
78x gear / wheels kit $ 11.36
80x gear kit $ 9.04
85x gear kit $ 13.88