I found a used bookstore!

Just as it was seeming to me the DC was a neverending series of malls with bookstores that only sold new books, I found a wonderful used bookstore in an area with a lot of restaurants and stores with used things: used clothing, used furniture, etc. It's Eastern Market, for the cognoscenti. It's the sort of used bookstore where lots of quality books are piled high above the shelves and along the floor and very frequently attempting to access a particular book triggers a downpour of books. Yay! Plus, they have a section entitled "Clintonia".