Fujitsu ScanSnap S1300i - Document scanner - Dual CIS - Duplex - - 600 dpi x 600 dpi - up to 12 ppm (mono) / up to 12 ppm (color) - ADF (10 sheets) - USB 2.0 - Walmart.com
Xerox Launches Affordable Duplex Scanner for Mobile Users | Xerox Newsroom
Amazon.com: Doxie Pro DX400 - Wired Document Scanner and Receipt Scanner for Home and Office. The Best Desktop Scanner, Small Scanner, Compact Scanner, Duplex Scanner (Two Sided Scanner), for Windows and Mac :
Double-sided Scanners & Printers | Brother UK
Epson Workforce DS-520 Color Document Double Sided Scanner - For Parts | eBay