Here is a list of short-run and long-run offset printers who specialize in printing books. Many of these book printing companies allow you to submit requests for printing quotations from their website.
If you know of other book printers who should be added to this list, please email John Kremer at email@example.com.
A listing of a book printer here does not imply an endorsement. Always be sure to check their references before sending them any money.