Amazon.com has the 84 pack of McCafé K-Cups for $35.96, after a 20% coupon and the 5% subscribe and save the total comes down to $26.97. ($0.32 per cup)
If you have the 15% s&s discount, it comes down to $23.38($0.28 per cup)
https://www.amazon.com/dp/B00TY15GO6/