advice needed - where to buy ski accessories in France

hi guys,
i am going to ski in Val Disere (france) soon. this is my first time in france. our flight arrives to Lyon city. i need to buy some stuff like helmet socks and clothing for ski. can someone please advice where is cheaper to buy these things, whether in Val Disere or in the Lyon city.
i am afraid that the prices on the ski resort will be very expensive. any ideas?

It will be much cheaper to buy in Lyon. Au Vieux Campeur http://www.auvieuxcampeur.fr/?acc=1 has 10 shops there. Decathlon also has a store there http://www.decathlon.fr/fr/store?store_id=PS_190&rememberMe=off Be careful the sales are on so you might end up buying more than you need :D.

thanks for the advice SwingBeep.