I grabbed the Melitta one at Walmart for $7. Came with a few paper filters, which is good because they didn't have the reusable ones that size (will have to look for those).
I'm still finishing off a package of Tassimo discs but then I will try this. It will be an experiment... I'm not enough of a coffee person to know how to make it "good".
What you might find is that the little one-cupper cone filter might not be big enough to make a decent size mug/thermos of coffee. You might want to upgrade to the 6-cup cone, which uses #2 filters. That's the size I have and it's perfect.
Just experiment a bit with how much coffee you need to use to get the desired strength.
One other option you might want to look into (that's even more high-tech, but people who are coffee aficionados really love) is the Aeoropress. It's a fancier version of the traditional French press (e.g., like a Bodum).