I found a great and inexpensive ESP8266 based smart switches for ESPHome and Hassio. : r/homeassistant
Smart Switch using Blynk | IoT Based WiFi Switch - IoT Starters
Wireless Switch with NodeMCU (ESP8266) and a Relay | by Alejandro González | Trabe | Medium
ESP8266 Based Webserver to Control LED from Webpage
TASMOTA Smart Switch by Martin Jerry | ESP8266 2.4GWiFi, Smart Light Switch for Home Assistant | WiFi Smart Home Devices: Amazon.com: Tools & Home Improvement
Failsafe IoT Light Switch with ESP8266… – EverythingESP
ESP8266 Wireless Light Switch - UK Mains - Schematic/PCB Review and Suggestions - Project Guidance - Arduino Forum
ESP8266 NodeMCU Relay Module - Control AC Appliances (Web Server) | Random Nerd Tutorials