These TP-Link Smart Light Switches drop from $39.99 to $29.99 when you apply the code EMCRDCE57 in your cart at Newegg. Plus, the shipping is free. This is the lowest price we could find for one by $5 before adding shipping elsewhere. These switches connect to your home WiFi network and can be controlled or set to a schedule using an iOS or Android app. They're also fully compatible with Amazon's Alexa. There is no sales tax.