LoveSales - Find and save products you love, get alerted when they go on sale.
Savelist - Found products you want but not ready to buy?
TrackIf - Alerts you if the price of your favorite products drop
Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
Giftwhale - Giftwhale allows you to create personalised wish lists online.
Price Snoop - When viewing a product on Amazon, Price Snoop will show you just how much it costs on the other...