The Step-Up / Step-Down S18V20F12 inverter module gives the output voltage of 12V with a wide input voltage range of 3 ... 30V and a maximum output current of 2A. Polol 2577

This NEMA 17-size hybrid bipolar stepping motor has an integrated 28 cm (11″) threaded rod as its output shaft, turning it into a linear actuator capable of precision open-loop positioning. The stepper motor has a 1.8° step angle (200 steps/revolution) and each phase draws 1.7 A at 2.8 V, allowing for a holding torque of 3.7 kg-cm (51 oz-in). Pololu 2268

This tiny logic level shifter features four bi-directional channels, allowing for safe and easy communication between devices operating at different logic levels. Pololu - 2595

Linear potentiometer with force sensor. It has an analog output, it allows you to detect where and with what force the sensor strip has been pressed. Pololu 2729

Pololu - 2129

Pololu 2258

Great for learning the basics of gears and linkages, this Tamiya kit contains all the parts necessary to make a remote controlled crawler that picks up ping pong balls. Pololu - 2389

66 channel GPS receiver module LS20031. It communicates via the UART TTL interface with a refresh rate of up to 10 Hz. Pololu 2138

Pololu 2450

A set containing a set of connectors, jumpers and buzzer for the A-Star platform. Polol 3110

A set of adapters (adapter) from the motor shaft 6 mm to 12 mm, wheel holders from RC models. Pololu 2687

A set of adapters (adapter) from the popular 4 mm to 12 mm motor shaft, wheel holders from RC models. Pololu 2684