Relay Module 5V x 2 Relay w/ Opto-isolation - ProtoSupplies
2-CHANNEL RELAY MODULE | All Electronics Corp.
2-Channel Relay Module-10A [Two-Relay-Module] - US $1.40 : HAOYU Electronics : Make Engineers Job Easier
Amazon.com: HiLetgo 2pcs DC 12V 2 Channel Relay Module with Isolated Optocoupler High and Low Level H/L Level Trigger Module Triggered by DC 12V : Industrial & Scientific
In-Depth: Interface Two Channel Relay Module with Arduino