To be honest in Switzerland what your looking for should be available. I know of many people who train it to work, and just use their cars for the Saturday shopping run.

I guess you have tried the usual suspects like autoscout.ch

Also if you find a car there are a few give aways if the mileage on the clock is true or not. Check the pedals and driver seat for wear. A car with 20000km on the clock and worn pedals and driver seat has probably done in the region of 100000km