I got a book via www.bookfinder.com from Tacoma. I once found a scrap book at a used book store in Bremerton, WA, that someone had filled with songs (with music) that had been cut out of a Canadian newspaper c 1905-15 ("Mother my I go out to swim" on my website is one of them).

Anything good is hard to find in the Northeast US, but there's less interest elsewhere except in a few big cities. I've gotten several very good books that were discarded from midwest libraries because no one ever checked them out. [I've also gotten some real Scots classics that were discarded by Scots libraries.]

There was a great store for such run by an old woman about a mile north of the Ohio State Univ. campus, right on High St. Rarer is when a whole library goes defunt, and a book dealer buys the whole lot in a certain area at trivial cost (like folk songs and music)

Another good source for pretty new books is used book stores near big college campuses. Copies for review are sent to professors, who often throw them out, and the local book dealers grab them up. I've got some of those, too.