BuyDig via Rakuten offers the Nest Temperature Sensor 3-Pack for $99. Coupon code "HOME20" cuts that to $79.20. With free shipping, that's tied with last month's mention and is the lowest price we could find by $19. They work with a Nest thermostat (not included) within a 50-foot distance. Note: This coupon can only be redeemed once per account. (You'll need to be logged in for it to work.)
June brings some big deals and sales, but you're better off postponing certain purchases.