That depends heavily on where you are located. Here in Germany we have excellent shopping search engines with Geizhals and Idealo. Particularly Geizhals is an

That depends heavily on where you are located. Here in Germany we have excellent shopping search engines with Geizhals and Idealo. Particularly Geizhals is an indispensable product research tool since it does a great job of collecting, normalizing and filtering product attributes - it replaces the tedious process of comparing several incomplete spec sheets with different terms, values and units.