They give all of Girl Genius, and quite a bit of Buck Godot, away for free online. The links above will take you to the archives. But since it's fantastic, I figure it's worth giving them money.
And now I feel really bad, because I ordered all the Girl Genius collections they have, and the box disappeared after (the Post Office claims) it was delivered. Which means they're sending me another set of books, at their expense. Which means I have cost Studio Foglio money with my order rather than giving it to them.
They're being very nice about it. I still feel bad.
It's a great comic, for those of you who don't read it yet. And their customer service apparently rocks just as hard. Just so you know.