Cheap in-wall light switch actor? (433mhz, zwave, mysensors, homematic)

Hi there,

I’m looking for cheap actors that I can hide behind my light switches.
Ideally, they combine the actual switch and relay like the Homematic 103029 which connects to a light switch as well as the light.
Homematic is very expensive, so I’m looking for cheaper options.

I currently have RFXTRX433e, Zwave dongle, Homematic and mysensors (433) devices.

A solution for mysensors would be (as separate modules):


But I prefer something self contained.

Can anyone suggest any cheaper modules?