Amazon [amazon.com] has TP-Link Kasa Smart 3-Way WiFi Switch HS210 KIT on sale for $29.99 w/ $10 coupon on web page. Shipping is free for Prime members.
Kasa Smart 3 Way Switch HS210 KIT, Needs Neutral Wire, 2.4GHz Wi-Fi Light Switch works with Alexa and Google Home, UL Certified, No Hub Required.
