M is for Mystery
by John Meadows
(Stevenson Ranch, CA, USA)
M is in San Mateo, CA. Their focus is (strangely) Mysteries - but their real emphasis is on the collector.
They have OCD when it comes to getting your book to you in the same condition in which they received it. All signed purchases arrive in Brodart, and they get as many or more authors on tour as any other store I know.
Small store, big heart, staffed by book folk. How could you ever ask for more? (http://www.mformystery.com)