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 $ 5.39
1x SG90 Tower Pro Servo $ 7.92
6x SG90 Tower Pro Servo $ 17.06
1x SG90 Tower Pro Servo $ 3.96
Stepper motor with ULN2003 driver $ 5.03
28YBJ-48 stepper motor $ 3.84
28YBJ-48 driver $ 3.23
5x Mini Motor 3V $ 6.92
75x gear kit $ 11.04
75x pully/gear kit $ 15.24
78x gear / wheels kit $ 12.42
80x gear kit $ 9.04
85x gear kit $ 15.18