Nowy Sącz gives many opportunities for its inhabitants to do shopping.
You can buy groceries either in hole in the wall shops or in large supermarkets (Real, Rafa, Biedronka, Plus, Asort).

If You want to do bigger shopping including clothes, beauty care products, gifts etc. the best place to visit is either Europa II Plaza mall or the city center where plenty of various retail shops are located.

If it's still not enough for You, going to Kraków can probably be the best sollution. In this city one can find lots of large shopping malls as well as entertainment centers.