Firefox extensionThis plugin offers a quicker access to Amazons deals & discount pages, your wishlist ...etc.You can directly browse to categories from a simple button in Firefox
Autosuggest Amazon Search PluginMake sure you replace the existing "Amazon.com" searchplugin in the right uppercorner of you browser by "Amazon Search" if you would like to receive autosuggestion while you search
Amazon Deal of the Day RSS FeedBurn this feed in Feedburner to follow Amazon's deals of the day.

ShopSheep

Select your preferred Amazon country store
Choose a category, e.g. books
Set your discount range let's say between 30%- 70%
Enter your search-term & hit the submit button

Country:
Percentage off:

Category:
Search Term:
Optional

Price Range: to
Sort Results by: