Amazon has select TP-Link Kasa Smart Products on sale as listed below when you apply the corresponding promotion code at checkout. Shipping is free w/ Prime or on orders $25+.
TP-Link Kasa Smart WiFi Outdoor Plug (Black, KP400)
$26.99 with promotion code 8KASASMART
TP-Link Kasa Smart 3-Way WiFi Light Switch Kit (HS210KIT)