Book sales, among other places.
This is three days worth of book-sale hauls, from two sales. Most of it is going to Michigan State University's Comic Art collection. The nice thing about being in DC is the international culture - almost 100 of these books are manga in Japanese, and there's even a Jacques Tardi album that MSU doesn't have yet.
And sometimes your family provides, like this nifty light-up Superman bust. Oddly enough, my wife wouldn't let me keep the whole cake.