TTL, not specifically Ethiopian, but you might try
http://www.keurig.com/coffee/africana-coffee-k-cup-vh
Also, the patent has expired so you will start seeing more companies selling their own coffee in k-cups when they get production facilities up and running since they don't have to contract with Green Mountain now to do it.
This is the reusable k-cup we have. I think there are a few more options out now, not sure if they are better.
Oh and I don't drink much coffee, but when I do it is Green Mountain (or one we can get from them). Right now it we have pumpkin spice