No undiscovered gems, but some cheese/food shopping ideas:
The Cabernet & Co. in Naperville has a nice selection of cheeses, with tastings on Saturday afternoons (along with wine). The strip mall where Cabernet & Co is located also includes Trader Joe's, Great Harvest, Succulent Seafood, and Casey's grocery store, which has a nice deli section. People love Casey's meatloaf and chicken salad.
Binny's on Ogden in Naperville also has a cheese counter. City Meat Market is located in that strip mall, as well.
Long-time residents of Aurora swear by Prisco's grocery on the southwest side of the city for their deli and salads.
There are 2 locations for Zeppe's Italian market, which carry Italian meats and cheeses, sauces, pastas, etc. One is in Naperville, the other in Oswego. I noticed another deli in the general strip mall in Oswego -- maybe Polish? I haven't tried it yet, and haven't been by there for a while, so I'm not 100% sure it's still there.
There's also the Blue Goose grocery store in St. Charles, which has a nice deli section, along with a good frozen food section, carrying unusual items like duck, bison, etc. I like local grocery stores because you never know what you'll find.
Cabernet & Co.
88 W Gartner, Naperville
630-596-9463
Binny's
790 Royal St George, Naperville
630-717-0100
Prisco's
1108 Prairie Street, Aurora
630-264-9400
Zeppe's Italian Market
529 W 87th Street, Naperville
630-753-0955
2757 US Highway 34, Oswego
630-554-0048
Blue Goose Super Market
164 S 1st Street, St Charles
630-584-0900