Dear Susan,

S> I have searched Barnes & Noble for the recommended books and there
S> are no new ones (and probably even used ones) available. How do
S> people get these?

You can find a wider choice by searching http://www.addall.com/

Several books (for example, Pali Primer), are available on-line.
Some of them are listed in the Pali section of http://dhamma.ru/sadhu/
directory.

Dimitry