Here is all the info on all the different passes.

And I see they even give you a discount if you use blabla car to come to Chamonix. Which is probably the cheepest travel option too, but it depends on wat happens to be offred ont he day that you need to travel. They have links for blabla car too on the website:

http://www.compagniedumontblanc.co.uk/en/lift-passes

Otherwise there are either buses that go from the gare routiere or there are shuttles from the airport, the good thing with the shuttles is that you can choose the time that is conveniant for you and they also bring you right to the adress that you give them.