Where to get diner brand coffees?

So I have always found diner coffee to be the best tasting coffee in the world. The coffee sold at the supermarket tastes nothing like that you find in a diner. Where do they get their coffee from and can I buy it myself to brew home? What is the name of the coffee? Like do diners have an exclusive deal with coffee... show more So I have always found diner coffee to be the best tasting coffee in the world. The coffee sold at the supermarket tastes nothing like that you find in a diner. Where do they get their coffee from and can I buy it myself to brew home? What is the name of the coffee? Like do diners have an exclusive deal with coffee brands to buy and sell just their coffee because no two diners sell the same tasting coffees.
Can someone give me some information. Thanks
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