Big news from Chamonix bus is that Line 2 – Les Bossons/Le Tour, will now stop outside the hospital, only 50 meters from the chalet.
The line will run every 30 minutes from 06:30am - 8:00pm Monday to Friday, all year round. On Sundays and bank holidays there will be one bus per hour (mid season only).
Timetable and more info here:
http://chamonix.montblancbus.com/en/news-network-chamonix-bus