In brief: view the list of hot books at the Ann Arbor District Library with links and prices from Amazon.
This is best viewed with your favorite local library's Library Lookup bookmarklet or Greasemonkey script installed, so that you can click through to see whether you can get the book from your local library.
The page takes a LONG time to load - it's loading 100 IFRAMEs from Amazon, each of which has an image to load - but it did not take a long time to write the code to make it be.
This view brings up some very interesting results. At this instant in Ann Arbor there are 14 holds for "S is for Silence", and the cheapest copy of it on Amazon is $0.65 + postage. There must be some way to get cheap books through to patrons who have been waiting patiently for popular items without having the cost of cataloging a book and adding it to the collection (and then getting rid of it when it isn't popular). Slap a sticker on it that says "Donated by ... please return to library book sale", fill the hold, and let it walk out the door forever?