What and amperage are you looking to switch for your specific project?
These allow you to automate lights or appliances via Wi-Fi or Bluetooth without a hub. They are designed to fit into standard wall boxes behind your existing switches. Shelly Wi-Fi 1 Mini Gen3 Smart Relay Best Buy& more Go to product viewer dialog for this item. buy relay switch
A standard component for DIY projects that switches up to 10A. Sold for $2.00 at aretronics.com or $2.50 at Goliath Automation & Robotics . Industrial Power Relays What and amperage are you looking to switch