Indeed, this is exactly how i shop. In Canada, the largest book chain is Chapters/Indigo - and they have a distinct error in strategy; they have made it policy to only sell books at the publishers recommended or listed price on the book. Now, everyone else in the book business sells at a discount, or with sales, etc., but not them - and another critical error, is that they won't match prices. So while i'm in their store, enjoying their starbucks coffee and free wifi while parusing their shelves, i'm logged into amazon.com (in the US) and "adding to cart" all the books i like. - before i've left chapters, i've ordered all the books i like from amazon at a huge discount (sometimes 50%) and have already received their order confirmation. It's great! although, not so good for chapters.
evolve or die!