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Amazon has the TP-Link HS200 Smart Wi-Fi Light Switch the cheapest I’ve seen for a single pack – $ 19.49 after the $ 3 clipped coupon. There have been comparable price-per-unit FP deals for the two pack (i.e. two for $ 37 or two for $ 40). But if you only need one, then here you go.

Because the cost of one is less than $ 25, free shipping is only available for Prime members or if you add filler items for those that don’t have Prime.

I think clipped coupons can be YMMV sometimes (and may not appear if you’ve used the coupon already). Simply going into incognito mode shows the coupon still there, but I have no other way of checking universal qualification.