The most convenient way to gather information is via the web. Once you've decided what you're looking for in a scanner, there are matching engines that will filter through a catalogue of scanners and pick the ones that match your criteria. For instance, some engines let you specify the type of scanner, price, interface, scanning area and manufacturer. When you've narrowed the search to a handful of models you can start reading reviews.
Articles usually comment on image quality, price, speed, usability and software bundles.
It's always a good idea to check out feedback from people who own the product, or ask friends and family what they recommend. Many sites have editor's picks or top 10 lists. Credit cards are a convenient way to buy plus some companies automatically insure your purchase against loss, theft or breakage. Before purchasing make sure you've read all the fine print about returns, restocking and shipping fees. Warranty Not all warranties are created equal.