We also have a keurig. Have found the best price at costco for their kirkland brand. It's not my favourite coffee but it's ok. When we go to the states we like to stock up. Walmart has a great value brand and it's actually quite good.

We have a water place here in town that sells them individually, 24 for an even $20. I like doing that the best so we can get whatever and how many we want.