The browsable and searchable site of this Chicago based store describing itself as "the oldest and largest full service Jewish bookstore in the midwest" offers books
This Hebrew language site functions as a middle man between those who have books to sell and those looking for particular titles. You can search by title, author, or keyword or browse by subject. Each book has a price attached to it. When you find the person or store that has the book you want, you contact him by email or phone and complete the sale. Of particular note is the searchable database of bookstores in Israel that sell both new and used books.
Based in the UK, Fishburn specializes in antiquarian and hard-to-find books Jewish books in Hebrew, English, German and Yiddish. Catalogs are available in pdf format online, and you can order by phone, fax, or email.
Henry Hollander Books
Catalogs from this antiquarian Judaica dealer based in San Francisco. Out of print book searches are also performed. Of particular note is the glossary of book collecting terms.
Based in Los Angeles, California, this bookstore is a worldwide distributor of Hebrew Language textbooks and can procure for you any book published in Israel.
Jewish Russian Books
This site describes itself as the largest website for Russian language Jewish books. You can search by keyword, browse by category, and order online.
List of Worldwide Hebraica and Judaica Booksellers
Compiled by Roger Shlomo Harris, this site contains an alphabetical list of bookstores. The list has not been updated since 2013 but it is still a useful resource.
Mendele Mocher Sfarim BeInternet
This Hebrew language online book store offers ebooks in Hebrew that can be downloaded to an iPhone, Windows or Firefox. While most of the titles are for sale, there are some materials available for free.
My Jewish Bookstore Online
This joint project with Sefer Sefari provides an annotated list of English language Judaica arranged by subject and searchable. This site is a front end to Amazon.com which fulfills the book orders. Each quarter the sites commission proceeds are donated to charity. An excellent list of Jewish and general charities is also available.
Describing itself as having "the largest of English Judaica in Israel under one roof," this Jerusalem bookseller also has a large selection of sifrei kodesh in Hebrew and can provide any book printed in Israel. The online catalog is browsable by subject and items may be ordered online.
The Hebrew and English searchable site of this Tel Aviv based bookstore that specializes in rare Judaica and rabbinica has a stock of 100,000 books, 80% of which are out of print and 90% of which are in Hebrew. It also has a large collection of Yizkor books and privately printed titles.
Searchable and browsable site of this San Diego, California based used and antiquarian book dealer with an inventory of over 3000 Jewish books on a variety of topics and in a variety of languages. You can order online as well.
Despite the fact that Steimatzky is the largest English language bookseller in Israel, most of this site is in Hebrew. English language books on Israel are listed.
The Book Gallery
This searchable site in English and Hebrew is the online home of The Book Gallery store in Jerusalem, specializing in rare and out-of-print titles. You can browse the catalog by category or seach by keyword. Books may be ordered online.
A rare book resource that provides a database of over 15,000 Hebrew book titles printed prior to 1800 with auction prices dating back two decades, a searchable antiquarian book service with Hebraica and Judaica, an exhibit of material from the 16th to 18th centuries that is updated weekly and an auction service for fund raising. The site also features live specialists who will answer questions and an appraisal service for antiquarian Hebraica and Judaica.