This variety of k-cup is $48.49 for 96 k-cups. If you do the math, that's $0.51 per k-cup.
Amazon is a bit wordier with how they named this product. They call it "Starbucks Dark Roast K-Cup Coffee Pods - French Roast for Keurig Brewers - 4 Boxes (96 Pods Total)".
Some additional details about this product:
Need to know more? You can read more about this product on Amazon.
Oh, and here's a bunch of pictures if you've never seen k-cup pods before: