Now it is mostly book scanners (previous topic I posted back was about document scanners - they require book cutting)
Fujitsu ScanSnap SV600
About $600
http://www.amazon.com/Fujitsu-PA03641-B005-Document-Scanner/dp/B00FPW9946
Microtek Book Scanner XT3500
Fastest affordable flatbed book scanner.
Special edge for book, LED lighting, fast speed, automatic book sensing.
Just for fun - video of Inotec book scanner
Btw, also for flatbed book scanners it is good idea to check Avision
A4 model - https://www.avision.com.tw/motion.asp?siteid=100407&lgid=2&menuid=10075&prodid=121299&cat=13
A3 one - https://www.avision.com.tw/motion.asp?siteid=100407&lgid=2&menuid=10075&prodid=121298&cat=13
FB2280E is quite fast, behind Microtek, but better than Plustek mpdels. And usually are available at less price.
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