Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
Ballwool - social network marketplace
Fetchee - Fetchee is a free price tracking wish list app that works with all online stores worldwide.
Hointer - Create the future of customer experience with Hointer technology platform for stores.
Keepa - Price history charts and the option to be alerted on price drops for all Amazon sites.
Mango - The first simple online payment solution in Latin America