Amazon PDX Linky: is a Firefox Greasemonkey script, based on the LibraryLookup tool by Jon Udell. It adds two links to a book page from Amazon based on the ISBN. One link looks up the book at the Multnomah County Library and the other looks up the book at Portland's Powells Bookstore. Powells has several locations in Portland and once at their site you can find new and used copies based on store location. Kind of nice when you simply don't want to wait for it to be shipped.