TrackIf - Alerts you if the price of your favorite products drop
Lootr.com - Lootr - Your favorite amazon price tracker. Saving you from paying full price.
Giftwhale - Giftwhale allows you to create personalised wish lists online.
Hukkster - Track products on sites you love. Get notified when those products go on sale.
Fetchee - Fetchee is a free price tracking wish list app that works with all online stores worldwide.
Savelist - Found products you want but not ready to buy?