Yes, we are renting the car in Geneva. There is a way to save money by renting the vehicle in French sector of Geneva airport. Downside is that car might not have Swiss vignette ($40 if driving on Swiss toll roads) and winter tires (all Swiss cars have winter tires) but the same class car is half the price even with the fee/supplement for winter tires.
Mont Blanc Tunnel to cross into Italy is $50 and last year I purchased 10 passage card for $150 and it is good for 2 years.
We have reserved airbnb in La Thuile for $1400, 200ft. from the slope, incredible bargain. Since we can cancel that reservation until January 14th, I am still thinking about finding something in Courmayeur but everything so far is much smaller and La Thuile just makes more sense. This will be my third time in Valle D'Aosta and there is so much to explore and ski . For a brief second I was thinking about going somewhere else and still might do that in March. Another thing that I am looking forward to is 2 new lifts at La Rosiere (just over the ridge from La Thuile) that opened up huge terrain on Mont Valaisan. They just opened on Dec. 15th
Since I have the MCP, we might (or might not) ski couple of days in Chamonix if for no other reason but to go have lunch at Les Vieilles Luges in Les Houches.