USB-RLY04 - 4 x 16A USB relay , from Devantech for €36.45
USB Relay 1 Channel | 102056 | Other by www.smart-prototyping.com
USB Relay Modules - Numato Lab | DigiKey
USB-RLY08-C - 8 channel USB relay , from Devantech for €48.51
USB Eight Channel Relay Board for Automation
Lcus - Type 1 Usb Relay Module Usb Intelligent Switch Control | Fruugo BE
4 Channel USB Relay Module_ Botland - Robotic Shop
NOYITO 4-Channel 12V Computer USB Control Switch Relay Module Drive-Free Relay Module Plug and Play Suitable for PC Smart Controller: Amazon.com: Industrial & Scientific
Arduino 2 Channel USB Controlled 5V Relay Module
4-Channel USB Relay Board with 6-Channel A/D Interface
DC 5V USB Relay 2 Channel Programmable Computer Control Power Supply Module for Smart Home Controller Relay Board 250V 10A: Amazon.com: Industrial & Scientific
16 Channel USB Relay Module With GPIO And Inputs | Numato Lab