Pololu

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US$7.69
Offset 3mm D shaft, Typical operating voltage: 4.5V, Gear ratio: 180:1, Free-run speed/current @ 4.5V: 80 rpm/80 mA, Stall current/torque @ 4.5V: 800 mA/30 oz·in.
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US$7.69
90° 3mm D shaft, 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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US$7.69
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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US$8.05
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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US$8.05
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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US$139.93

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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US$27.93
This is a general-purpose programmable module featuring a 2.4 GHz radio and USB.
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US$55.93

This set is intended for those looking to create a differential-drive robot with dual quadrature encoders. The encoder will work with any micro metal gears from Pololu ranging 5:1 to 298:1. Note: Micro metal gears are not included in this set.

Delivery within 2-3 weeks
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US$13.18

These universal aluminum mounting hub allows you to mount custom wheels and mechanisms to 5 mm motor shafts.

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US$5.59
This is a 8 x 3.4mm vibration motor perfect for non-audible indicators. It is fully-enclosed with no exposed moving parts.
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US$1.72

This is a 12-inch (30-cm) cable that has three 26 AWG wires attach to a 3-pin female JST PH-style connector.

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US$2.18
These cable will mate with the connector on 3-pin Sharp analog distance sensors, such as the GP2D120XJ00F (4-30 cm), GP2Y0A21YK0F (10-80 cm), and the GP2Y0A02YK0F (20-150 cm).
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US$7.14
This is a 24-inch(60-cm) twisted cable that can be used to extend the leads of many common RC hobby servos.
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US$11.59
This is a pair of custom designed white plastic wheel frame inside the rubber tire. This rugged wheel is designed to fit securely on output shafts of micro and 15.5D metal gear motors.
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US$9.77
This wheel is designed to fit on output shafts of the micro and mini metal gearmotors, as well of those in the Solarbotics metal gear motors.
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