Do a google search for E.S.E. Pods. Amazon has them and so does many reputable coffee sites.
http://www.wholelattelove.com/coffee...?cid=4&scid=42
http://www.1st-line.com/coffee/espresso/pod/pods.htm
I am looking into filling them myself with my home roast so my sister in law can fresh roast (sort of).