[GOP Jedi]

Abebooks.com (http://www.abebooks.com) is a great resource for OOP books. For example:
http://dogbert.abebooks.com/servlet/SearchResults?an=Maud+Hart+Lovelace&y=11&sortby=5&x=60

[JohnnyZ]

Thank you! There's alibris, too....

.... but it'd be nice if some clueless parents could walk into a bookstore and see these books on a big display and catch on that they must be good.