Have a look at the chamonix.net page on traditional food. And you can see here the list of people and stands that are present in the main Chamonix Market.
Saturday morning: 8am to 2pm.
Weekly Markets in Chamonix and Haute Savoie
A wide range of local produce is sold at the local markets. Here are the closest to the Chamonix Valley. The main markets are in bold type.
Les Houches: Monday from 8am to 12am.
Chamonix Sud (in season): Tuesdays from 8am to 12am.
Samoens: Wednesdays from 8am to 12am.
Saint Gervais: Thursdays from 8am to 12am.
Megève: Friday from 8am to 12am.
Sallanches: Saturday from 8am to 12am.
Argentière (in season): Sunday from 8am to 12am.
Don't forget that it might be difficult to park you car near the market squares. And you can see here the list of persons and stands that are present in the Chamonix Market every Saturday morning.
Markets in Italy
Aosta: Tuesday from 8am to 4pm.
Courmayeur: Wednesday from 8.30am to 1pm.
Turin: Every day 8.30am to 12pm and Saturday all day.
Markets in Switzerland
Martigny: Thursday morning.
Haute Savoie Crafts Wood Carving: Local craftsmen and women continue to carve a wide range of items from huge works of art, particularly local fauna, to boxes and other useful articles which make good presents.