Where to buy apple books?

[forrestc@lewis.mt.net (Forrest W. Christian)]

I'm looking for a couple of apple II books to buy (before I break down and
(illegally) photocopy the interlibrary loaned ones I have in my
possession).

Specifically, I'd like to buy a copy of Understanding the Apple II,
Beneath Apple DOS and Beneath Apple ProDOS.

Does anyone know where I should be looking?  I posted a WTB: message in
comp.sys.apple2.marketplace but was hoping that someone knows someone who 
has a stash of Quality Software books somewhere.

-forrestc@imach.com