For 98% of the world who doesn't live on the Northeast coast of the United States, you're missing out on what I believe to be the best cheapest cup of coffee money can buy: Wawa Coffee. The elixir of life.
Wawa is a small convenience store chain that got famous for selling made to order sandwiches and other run-in-run-out things. But unlike 7/11, it's more "upscale" (if you can even use that word to describe a convenience store).
Anyway, it's available 24/7, and they have a huge selection to choose from, Kona Blend, Cuban Roast, Dark Roast, Regular, French Vanilla, Decaf (for some reason), Pumpkin Spice in the fall, and everything in between. You have to make it yourself though, but their creamer and sugar selection is just as vast: Irish Cream, light cream, almond milk, skim, whole, 2% milk, and so on.
$1.50 will get you a 20 ounce, and if you buy their reusable thermos cup, $1 buys any size you want.
It kicks the ass of Dunkin Donuts, McDonald's "McCafé" and I think it's even better than Starbucks--only because Starbucks is pretty expensive.