The same trick that could save you money buying a car also works for online shopping

Getting better deals while shopping online is as easy as not buying anything ... right away.  In "Rock Breaks Scissors: A Practical Guide to Outguessing and Outwitting Almost Everybody," William Poundstone explains how to trick websites into offering you discounts using a method he calls the "abandoned shopping cart ploy." It's simple: Fill up your cart on any retail site and start the checkout process, partially filling out your shipping information and email address -- but no payment informat...