+1. Pre-filled is way, way more expensive than fill-it-yourself.
It doesn't matter where you buy pre-filled K-Cups, it's always cheaper to buy a bag/can of coffee and use it to fill a reusable one. I have access to Costco and the military commissary, and it's still true. [Post edited by HowieT3 at 03/17/2017 12:27PM]