here's a place for western books. pretty cool. prob top ten bookstores i've seen.
Buckingham Books web site
www.buckinghambooks.com
a couple others of interest
https://argonautbookshop.com/ this one is in San Francisco CA
https://www.carpediemfinebooks.com/ this one is in Monterey CA
all three have pretty good on-line inventory but all are acquiring books frequently
there is a really good store in phoenix, but they don't list books. they have two stores, over 10,000 ft2. get collections all the time. 602 468 0400, ask for mike. he's pretty up to date from memory of his inventory. lots of government documents as well, super amazing collection.