Pi-SPi-8KO Raspberry Pi Relay Output Interface – Widgetlords Electronics
Gravity: Digital 10A Relay Module For Arduino and Raspberry Pi - DFRobot
RPi Relay Board (B) - Waveshare Wiki
8-channel relay board for Raspberry Pi and Arduino from Peter Jakab on Tindie
Inland RPI 4-Channel Relay 5V Shield for Raspberry Pi/ CE Certification - Micro Center
PiRelay - Raspberry Pi GPIO Control | PiRelay - The easy way to Switch Relays using the GPIO Pins on a Raspbery Pi. Control anything from 1 to 100 Relays connected to between 1 and 10 different RaspberryPi's