Samsung SmartThings cuts 20% off sitewide during its 4th of July Sale. (Discount applies in-cart.) Plus, new customers can stack coupon code "Welcome10" for a combined 30% off. That's tied with last month's mention as the largest percent-off discount we've seen from Samsung SmartThings. Plus, all orders qualify for free shipping. SmartThings purport to let you control, monitor, and secure your home from anywhere in the world. Deal ends July 5.

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A couple of best bets, with prices after discounts:
-- Samsung SmartThings Arrival Sensor for $20.99 (pictured, low by $3)
-- Samsung SmartThings Outlet for $38.49 (low by $6)