DC 5V USB Relay 2 Channel Programmable Computer Control Power Supply Module for Smart Home Controller Relay Board 250V 10A: Amazon.com: Industrial & Scientific
USB Module - 2 Relays 16A with Snubbers, USB-RLY02-SN - Antratek Electronics
USB Relay Modules - Numato Lab | DigiKey
USB-RLY08-C - 8 channel USB relay , from Devantech for €48.51