I've got a few sonoffs installed and just realised that sonoff minis have an input for a momentary switch without tinkering, like in the sonoff basic. So it would be great to install them and replace the light switch mech with a momentary one. However I've been unable to find the mech at a price that's any less than the sonoff itself, which is a bit ridiculous. Does anyone know where I can get them for a dollar or two? Maybe I'm using the wrong name and that's why I can't find them?