Another used book store to add to one’s list of suppliers is Powell’s City of Books ( http://www.powells.com ). Its history is at http://www.bootsnall.com/namericatravelguides/pdx/dec01powells.shtml . Powell's is the largest independent used and new bookstore in the world. I have never really compared their prices.

In buying a book to throw in your pack or bag, remember the pages have other uses—kindling, note paper, TP. In selecting a book with consideration for the latter use, remember the wisdom passed on by Chic Sales in his book “The Specialist” (1929)—the main character was a specialist in building outhouses. Alternately stated by another, this wisdom is: And then there was the trauma when Sears and Montgomery Ward went to glossy paper in their catalogs. Glossy paper didn't work as pleasantly as the former non-glossy.