Pololu

CA$8.45
Typical operating voltage: 4.5V, Gear ratio: 120:1, Free-run speed/current @ 4.5V: 80 rpm/80 mA, Stall current/torque @ 4.5V: 800 mA/30 oz·in.
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CA$8.85
90° output shaft, Typical operating voltage: 6V, Gear ratio: 120:1, Free-run speed/current @ 6V: 85 rpm/70 mA, Stall current/torque @ 6V: 800 mA/65 oz·in.
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CA$8.85
90° output shaft, Typical operating voltage: 6V, Gear ratio: 120:1, Free-run speed/current @ 6V: 85 rpm/70 mA, Stall current/torque @ 6V: 800 mA/75 oz·in.
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CA$153.77

The 3pi robot is a high performance platform featuring two micro metal gearmotors, five reflectance sensors, an 8×2 character LCD, a buzzer, and three user pushbuttons, all connected to a C-programmable ATmega328 microcontroller. Capable of speeds exceeding 3 feet per second, 3pi is a great first robot for ambitious beginners and a perfect second robot for those looking to move up from non-programmable or slower beginner robots.

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