I try to aim for less than 50 cents per K-cup. Recently I got some 12-packs for $3.99 at Walgreens. In general though, I buy them at Costco the most. I also have a reusable K-cup, but I'm not terribly happy with it.
Mama to a teen and a
preschooler KINDERGARTENER!! -- oh, the fun! Also co-parenting 3 other awesome kids. :)