These 4 best ADF scanners will make you super productive.
Fujitsu fi-8150 Large Format Flatbed/ADF Scanner - 600 dpi Optical - antonline.com
HP ScanJet Pro 2600 f1 ADF Scanner - 600 x 600 dpi Optical - 48-bit Color - 25 ppm (Mono) - 25 ppm (Color) - PC Free Scanning - Duplex Scanning - USB - simplykleenusa
Amazon.co.jp: NEXX AV50F Mobile ADF Scanner, High Speed Sheet Feed Scanner (A4 15ppm Mobile) : Computers