As one of its daily deals, Best Buy via eBay offers the Kwikset Kevo Convert Electronic Smart Door Lock in Satin Nickel for $79.99 with free shipping. That the lowest price we could find by $47, although we saw for $10 less last August. It controls your existing deadbolt using an iOS or Android app. Deal ends today. Note: The Kwikset Kevo Plus Connected Hub, sold separately, adds functionality with Amazon Alexa, Nest, Ring, IFTTT, and more.