You can buy k-cups on Amazon (http://www.amazon.com/gp/search?ie=UTF8&keywords=k-cups&tag=shinythings-20&index=grocery&linkCode=ur2&camp=1789&creative=9325), which is still mail order. I've seen them at BJs. You may even be able to get them at some grocery stores. Green Mountain Coffee actually offers a pretty good deal with free shipping if you buy a certain amount.
We had a K-Cup machine for a while. If you like flat diner coffee, you'll like K-Cup coffee. It's not really bad... it just doesn't have much depth of flavor. I was pretty disappointed by it, but then I also roast my own coffee now. They do offer a basket that you can use with your own ground coffee but I didn't find that it tasted better than the usual K-Cups. They have a line of "extra bold" flavors which were better but still disappointing. Eventually we replaced the K-Cup machine with a Jura-Capresso (http://www.amazon.com/gp/search?ie=UTF8&keywords=Jura-Capresso&tag=shinythings-20&index=garden&linkCode=ur2&camp=1789&creative=9325) automatic espresso machine, which makes much, much better tasting coffee but obviously costs quite a bit more too.
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We had a K-Cup machine for a while. If you like flat diner coffee, you'll like K-Cup coffee. It's not really bad... it just doesn't have much depth of flavor. I was pretty disappointed by it, but then I also roast my own coffee now. They do offer a basket that you can use with your own ground coffee but I didn't find that it tasted better than the usual K-Cups. They have a line of "extra bold" flavors which were better but still disappointing. Eventually we replaced the K-Cup machine with a Jura-Capresso (http://www.amazon.com/gp/search?ie=UTF8&keywords=Jura-Capresso&tag=shinythings-20&index=garden&linkCode=ur2&camp=1789&creative=9325) automatic espresso machine, which makes much, much better tasting coffee but obviously costs quite a bit more too.