A tip of the hat to Winchbooks of Canberra (Australia), who were very helpful to this customer when there was a mix-up in valuation at Customs Canada. books@webone.com.au.

Abebooks and Alibris are, of course, the two most used by me, since their services have been taken up by so many bookstores, including some local ones here and the Australian one mentioned above. Very little that they don't come up with (except Brown, North Carolina Folklore volumes two and three).