Monoprice offers the Yale Real Living Electronic Push Button Deadbolt with Z-Wave Technology in Polished Brass, Satin Nickel, or Oil Rubbed Bronze for $79.99 with free shipping. (Poppy9780 via eBay charges the same.) That's $5 below our May mention of an open-box unit and the lowest price we've seen. (It's the best deal now for a factory-sealed unit by $12.) It features a fully motorized deadbolt lock, allows for up to 250 separate PIN codes, and works with many home-automation devices, including Amazon Alexa.

Update: Monoprice now charges $99.99; however, Poppy9780 via eBay still charges $79.99 with free shipping.