There are several student insurance companies around.

The most popular seem to be Swisscare, Goldencare and CSS Studentcare.

They are all very similar - offering low premiums (usually between 80.- and 90.- a month) and a low annual deductible (between 75.- and 100.- p.a.)

Some have add-ons available, some don't.

Premiums may vary if you choose to pay annually, quarterly etc. depending on which one you go for.

All 3 are reputable companies as far as I'm aware.