I believe the SkyPix Handheld Scanner is very practical for those who need to collect materials in library or anywhere else. You can scan and save your needed things with the little cordless scanner that comes with a microSD card.
SkyPix Handheld Scanner supports the images size up to 8.5×50-inch and the resolution up to 600dpi. Two AA batteries can provide it up to 180 scans.
SkyPix Handheld Scanner is priced at $119.95 USD. You can get it at HammacherSchlemmer.