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There are controll boards with servo ports and motor ports available. If you need one of those, take a look at Orangutan board from Pololu.
Servos contain three key parts: a motor/gearbox, a potentiometer used for motor position feedback, and integrated control circuitry. A servo has three wires: power, ground, and signal. You send pulses over the signal wire, and the width of the pulse tells the servo's motor to move to a corresponding position. Servos can be modified for continuous rotation, in which case the signal pulse width determines to the servo's rotational velocity rather than its position.A motor is much simpler than a servo. It has two leads across which you apply a voltage. The speed of the motor depends on the magnitude of this potential difference, and the direction of the motor depends on the direction of the potential difference. Motors have no integrated control circuitry. Instead, you typically control them with a motor driver (usually an H-bridge circuit) or a motor controller (a higher level device that uses an H-bridge to control a motor in response to some analog/RC/serial input).
...can i make the $50 robot with motors not servos? cuz motors are much cheaper than servos or will it cost more to me if i wanted to do it with motors?
umm. you can make your own h-bridge and there are ways to get parts cheap
umm. you can make your own h-bridge an h bridge is basically 4 MOSFETs , and its a fairly simple circuit
there are ways to get parts cheap