In reply to Aigen:
We paid €1000/ Month for a big 1 bedroom place 2 winters ago (seasonal rent, not annual - the landlady said it would have been €700/m for the year)
Now we stay in a 1 bedroom place for €570 for annual rent.
€600 living alone will be difficult - but I know plenty of people who pay €500 for a shared place.
Every Thursday this list gets updated, but you'll need to contact owners directly, more often than not in French.
http://www.chamonix.fr/PDF/LOUER.pdf
You'll often need 3 months deposit, or, sometimes, the full winter needs paid in one go.
Post edited at 15:49