Walmart offers the second-generation Samsung SmartThings Hub for $49.99 with free shipping. (Several merchants have it for the same price, including Home Depot, Amazon, Samsung, and Newegg.) That's $30 under our mention from May and the lowest price we've seen. (It's also the best deal we could find now by around $18.) The hub allows you to connect all of your smart locks, lights, outlets, and thermostats and control them with your smartphone via the free SmartThings app. It's compatible with iOS, Android, and Windows Phone.

Update: Walmart has since sold out, although it's still available for the same price at the other stores listed above.