It depends on whether you're willing to destroy the book to scan it also. If you cut the spine off the book, you can run it through a desktop scanner with a page feeder that will do duplex.
I've scanned a few books without destroying them. I can set my scanner to automatically keep scanning with a pause time in between scans of two seconds. That's enough time for me to turn the page and put the book back down on the scanner. This way takes more time obviously, but it doesn't ruin the book.
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