Let KAYAK do the searching
Based on KAYAK hotel searches, the most popular destination is Chamonix (90% of total searches to Mont Blanc). The next most popular destinations are Les Houches (5%) and Courmayeur (4%). Searches for hotels in Saint-Gervais-les-Bains (1%) are also popular.
KAYAK users have found double rooms in Mont Blanc for as cheap as $564 (Argentière) in the last 3 days. The average price is $588.