I have to second the cheap. I can either make a full pot of coffee for ~$2-3/pot or I can make a single cup for ~$.75/cup. I understand it might not be the best bang for my buck but I'm only interested in drinking one cup so it's pretty cost effective in my eyes.
"Good" - Keurig coffee is good enough for me. I don't think I have the palate to discern the difference between my K-cup and the $7/cup coffee in the high end cafes.
"Cheap" - I don't have the time to prepare drip coffee in the morning (or prepare the night before) so for me it's either Kcup or purchase at work. So Keurig is the cheapest option for me.