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Fourth generation in August WiFi smart lock is a snap to set up, works with all major digital assistants, and connects to your home network without the need for a separate bridge. It’s also for sale on Amazon right now. Smart Lock went from $ 249.99 to $ 218.69, a saving of just over $ 30. This is the lowest price on Amazon yet, and it’s the cheapest we’ve seen the smart lock nowhere until there.