Start with pricegrabber.com
As we learned in our price-comparison test, this site is hands-down the easiest to use and nets you the best deals.
Next try at least one of the runners-up
No one site always turns up the best prices. To easily access Google's or Bing's price-comparison sites, go to the main search engine page and click on the "shopping" tab.
Typing in "Lady Gaga" can bring up headphones, sheet music, and a paperback biography. If you want music, include "CD" or "MP3."
Sometimes the prices shown in search results are incorrect, so click through to the e-tailer to double-check them. For example, when we looked for the novel "Wolf Hall," one comparison site showed that Walmart's price before taxes and shipping was $11.49. But when we clicked through to Walmart, the price was actually $14.50. Also click around to confirm shipping costs, and while you're at it check return policies.
Know your model numbers
The same product might come in multiple models with different features and prices. For true comparability, type in the brand name, the model name (if it has one), and the model number.
Be open to new sites
One of the best things about starting with a search engine is discovering great sites. When we searched for the "Avatar" DVD, we found Glyde, a great money-saving source for used DVDs, books, games, and CDs.
Get coupon codes
Never click buy until you've checked for them at sites such as Coupons.com and RetailMeNot.