Try these small ad websites: www.anibis.ch www.petitesannonces.ch
These are small ad websites for French speaking Switzerland. You can search them for people offering tutoring services; you can also place a free advert looking for a tutor.
You will of course need some basic French to navigate the site, but your spouse should be able to help you with that.
You could also put up a free advert card in your local Migros / Coop stating you are looking for a tutor.