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Amazon [amazon.com] has TP-Link Kasa Smart HS200 WiFi Light Switch for $ 17.99 – 30% when you clip the coupon on product page = $ 12.59. Shipping is free w/ Prime or on $ 25+.
TP-Link Kasa Smart HS200 WiFi Light Switch $12.59 + Free Shipping w/ Prime or on $25+