hi, i'm using mobility.ch option - you pay 150 CHF per year as membership fee, and then you pay per hour (about CHF 6, depends on a car model, includes all - gasoline, insurance, etc).  You can book the car and pick it up from numerous locations, return back to the same place.  There's an i-phone app that makes it super-easy to book.  So far I've been very satisfied.

Hi there and g'day....

I think the two "low cost" car rental you can find are:

enzolocation.ch

patricklocation.ch

If you think you gona rent often, Hertz offers a 30% members card...and sure mobility is a option as Gaini just wrote you.

Have fun,

alexandre 

For the large chains (Eurocar, Avis, etc.) I have often found that prices on www.expedia.com are much cheaper than on the chains' websites.  Why?  I am not so sure.  But I would guess that Expedia aggregates its bookings and offers them.

For some reason also, prices are lower on the Swiss side (rather than the French side).

Good luck!