I was mainly thinking of this topic related to food suppliers but why not restaurants too? What are you're favorite spots to get supplies or that favorite little place to eat?
Since I was thinking about suppliers, I'll add a few to start:
Sam's Italian Market, Willow Grove - Great deli counter, bakery, selection of pasta, cheeses, etc. The service is the best.
Plymouth Produce, Norristown - Neat produce + spot that has great prices and a big selection of Mexican goods, dried and fresh peppers, etc.
Dave's Poultry, Flourtown - In the Farmers Market, Dave's has a great selection of fresh chicken. I don't know the name of the produce place in the FFM but it is also excellent in my opinion in terms of selection and freshness of their goods.
Caspian Grill, Lafayette Hill - Ali is a very friendly guy who makes some good stuff with a Middle Eastern flair (the potato salad is amazing).
Taste of Italy, Springhouse - It's a deli primarily but also you can get lunch there and sit down at the 3 or 4 tables they have. They do a fantastic array sandwiches and have salamis, olive oil, etc. etc. but the thing that always brings me back is that a guy (Gregorio) brings the best bread down from NY every day! The small semolina loaf is just perfect with olive oil and a little salt and pepper.
Cisco's Bar, Flourtown - The decor hasn't changed in probably 50 years but for a local spot they make a great cheesesteak hoagie and the burgers are pretty damn good too. I think the prices are 50 years old too as it's hard to spend $20 in the place.
The Fairlane, Erdenheim - This spot has probably been there for 10 plus years. It's a tiny place that's basically a diner. Breakfast is awesome!