Screw Terminal Block Breakout Shield Module for Arduino UNO R3: Amazon.com: Industrial & Scientific
Amazon.com: Seeed Studio CAN-Bus Shield V2 Compatible with Arduino for Controller and Transceiver, Arduino Shield Adopts MCP2515 and MCP2551. : Electronics
Amazon.com: ARCELI USB Host Shield for Arduino UNO MEGA 2560 Support Google Android ADK USB HUB : Electronics
Amazon.com: Adafruit Motor/Stepper/Servo Shield for Arduino v2.3 Kit : Electronics
Amazon.com: RS232/RS485 Shield for Arduino : Electronics
HiLetgo Multi-Function Shield ProtoShield Multi-Functional Expansion Board Sensor Shield Module with Four Digital Display for Arduino: Amazon.com: Industrial & Scientific
Proto Shield Rev3 (Uno Size) — Arduino Online Shop