I´m not sure if anyone else found this but today I stumble over the "ESP8266 WiFi Relay V3.1" on ebay.de:
http://www.ebay.de/itm/302065993872
And after a short search with google I found the original vendor:
https://ex-store.de/ESP8266-WiFi-Relay-V31
What´s special about this device ... it´s flush-mounting able.
Did anyone of you guys bought this and give it a try?
The original firmware is closed source so using ESP Easy with this would be great

greetings
Dominik