Abe Books is an online second-hand book shop apparently owned by Amazon.com. Abe Books ships world-wide and indexes used books located at second-hand books shops around the world.
So you live in the US and want a book from a funky little used-book shop in London? Fear not, Abe Books likely has their books indexed, and chances are that shipping from the UK will be free. (It was for me in Canada.) Abe Books carries Christian book, including Adventist books, as well as books on thousands of other subjects.
Abe Books also carried new books.
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Good at commentaries.