The Wemo Smart Light Switch has just gone on sale for $29.99. This switch allows you to replace any light switch so that the connected lights can be controlled through Alexa or through a mobile app. Of course, the light switch still works as a regular physical switch. This sale price is just $1 higher than the lowest price this switch has ever been, which was during Black Friday 2016. This light switch is the #1 best-selling light switch on all of Amazon.