Computer hardware is expensive, so you always want to ensure you're buying at the best price. The Hover Hound extension for Chrome and Firefox compares hardware prices at Newegg with Tiger Direct and Amazon with a hover of your mouse cursor.
Once you've installed the extension, just head to Newegg and start browsing. As you peruse all the goodies, you'll notice a green "Hover Hound" button below the "Add to Cart" button. Just hover your mouse over that green button and you'll see the prices for the same item at Amazon and Tiger Direct. If you click the button, it will send you to wherever the price is the lowest outside of Newegg. It displays whether there is shipping and handling, and tells you whether an item qualifies for Amazon Prime.
You can also hover over the green button and click the "View Price History" link to see when the prices were at their highest and lowest for each seller, and what the prices were. To download the Chrome extension or Firefox add-on, check the links below.
Hover Hound | Chrome Web Store
Hover Hound | Firefox Add-Ons via Ghacks