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Camelcamelcamel - Easily monitor Amazon product prices and get alerts when they drop.
Giftwhale - Giftwhale allows you to create personalised wish lists online.
Fetchee - Fetchee is a free price tracking wish list app that works with all online stores worldwide.
TrackIf - Alerts you if the price of your favorite products drop
Savelist - Found products you want but not ready to buy?