Dear Chamberlain, Golf Foxtrot Yankee. Regards, Mike

The old one was $200. Apparently they have a new one is less, but still requires a cloud service.

ESP8266 - http://amzn.com/B081CSJV2V
Relay Board - http://amzn.com/B0057OC6D8 (just search "5v relay board"; there are less expensive ones)
ESPHome - https://esphome.io/