Electromechanical

US$2.72
Whisker Switches - Very sensitive lever switches. Great for detecting objects such as other sumo bots, walls, balls, etc. Simple to wire and attach to external ‘bumper’ bars.
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US$5.08

These are high quality Single Pole - Double Throw (SPDT) sealed relays. Use them to switch high voltage, and/or high current devices. This relay’s coil is rated up to 12V, with a minimum switching voltage of 5V. The contacts are rated up to 5A (@250VAC, 30VDC).

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US$4.13
This is a five way selectable switch often found as the pickup selector on electric guitars. The lever clicks through five different positions so you can select from three different inputs and a combination thereof.
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US$6.99

This is a white pair of micro metal gearmotor bracket extended, which enables convenient mounting of popular Sanyo-style miniature metal gearmotors.

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US$20.93
This quadrature encoder works with our micro metal gearmotors, 42×19mm wheel, and extended bracket to measure the rotation speed and direction of the wheel. 
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US$49.82
The six-channel Micro Maestro raises the performance bar for serial servo controllers with features such as a native USB interface and internal scripting control.
Delivery within 2-3 weeks
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US$1.39

This SPDT Slide Switch has pins with .1" spacing, making it the ideal breadboard friendly slide switch. Rated at 30V/200mA.

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US$3.07
This may seem like an odd one for us, but pull-chain switches are actually pretty handy! This is similar to the kind of pull-chain you'd find on lights and ceiling fans. It's a simple SPST on-off switch (pull once for on, pull again for off). This switch has 6" wire leads and a 10" pull-chain. The switch can be panel mounted in a 3/8" diameter hole.
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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$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$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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