Amazon.com: DEVMO L293D Motor Drive Shield Expansion Board Compatible with Ar-duino Duemilanove Mega UNO R3 AVR ATMEL : Electronics
Amazon.com: HiLetgo 3pcs Arduino Sensor Shield V5.0 Sensor Expansion Board for Arduino UNO R3 : Industrial & Scientific
HiLetgo Multi-Function Shield ProtoShield Multi-Functional Expansion Board Sensor Shield Module with Four Digital Display for Arduino: Amazon.com: Industrial & Scientific
Amazon.com: Adafruit Proto Shield for Arduino Kit - Stackable Version R3 : Electronics
HiLetgo L293D DC Motor Drive Shield Stepper Motor Drive Shield Expansion Board for Arduino Duemilanove Raspberry Pi: Amazon.com: Industrial & Scientific
Amazon.com: 4PCS L293D Mini Stepper Motor Drive Shield Module DC4.5-25V Expansion Board Module for Arduino : Electronics
Amazon.com: RS232/RS485 Shield for Arduino : Electronics
8x8 88 RGB LED Matrix Module Driver Board + Full Color Rainbow V2.0 Mini Dot Matrix RGB LED Driver Shield for Arduino AVR: Amazon.com: Industrial & Scientific