Here’s one that may be useful for Australian users.
I put a Broadlink RM2 in the bedroom to control IR devices (A/C, TV etc), and noted the RM2 also controls devices using RF.
Happened to be in Jaycar and noticed the Remote Controlled Mains Outlet Controller
https://www.jaycar.com.au/remote-controlled-mains-outlet-controller/p/MS6148
also companion products
MS6147 and MS6149
Bought one on the off chance and sure enough these work great with the Broadlink,and therefore in Home Assistant
This is a really cheap way to add mains switches to your HA setup using the broadlink component. Once you have the remote, each additional mains switch is about $13.
I haven’t had a chance to work out how far from the RM2 they can be and still work, my house is too small, but should be about 30m.
Using these with the emulated hue component to be able to switch on and off the bedside lamps with Echo or Google Home.