1 Channel Relay Shield Module, 10PCS DC 5V Indicator Light LED Module for Arduino R3 MEGA 2560 1280 ARM PIC AVR STM32 Raspberry Pi MCU DSP Official Boards Shield (10PCS): Amazon.com: Industrial
Keyestudio MEGA Sensor Shield V1 for Arduino MEGA
Amazon.com: MEGA 2560 R3 Proto Prototype Shield V3.0 Expansion Development Board + Mini PCB Breadboard 170 Tie Points for arduino DIY Kit : Electronics
Mega Multi IO Shield For Arduino Mega / DUE - DFRobot
KEYESTUDIO MEGA Prototype Shield V3 Board for Arduino Mega R3 2560, with 170 Points Breadboard Solderable, Easy to Use, Great for Prototyping Circuit Building Projects
ARCELI USB Host Shield for Arduino UNO MEGA 2560 Support Google Android ADK USB HUB
ElectroCookie Proto Shield Kit Compatible with Arduino Mega R3, Stackable DIY Expansion Prototype PCB (2 Pack)
Amazon.com: Arduino Mega Proto Shield REV3 (PCB) [A000080] : Electronics
Amazon.com: KEYESTUDIO MEGA Sensor Shield V1 for Arduino MEGA R3 2560 Prototype Board Projects : Electronics
Amazon.com: SunFounder MEGA Board Compatible with Arduino IDE ATMEGA2560 ATmega16AU + USB Cable : Electronics
Amazon.com: WINGONEER Prototype Screw/Terminal Block Shield Board Kit for Arduino MEGA 2560 R3 DIY : Industrial & Scientific