Plustek PS30D double-sided document scanner, with 50 sheets Auto Document Feeder (ADF). Searchable PDF Function by Abbyy OCR. Support Mac and PC - Newegg.com
Amazon.com: AMBIR nScan 1060 60 ppm High-Speed Document, Card and Passport Scanner, 9 Programmable scan Modes, Supports-Color, Black/White & Grayscale, Versatile, Double-Sided scanning, USB, Windows ONLY : Office Products
A3 Large-size Colorful Double-sided Paper Feeding Document Scanner, With Dual Channel Paper Feeding Mechanism Design - Figurines & Miniatures - AliExpress
Duplex Portable Scanner
Epson Workforce DS-520 Color Document Double Sided Scanner - For Parts | eBay
HP Wireless Portable Document Scanner for Double-Sided Scanning – HP WorkSolutions
Fujitsu ScanSnap S510 Double-Sided Scanner PA03360-B515 With Power Supply | eBay