Paribus - Find out for free if online stores owe you a refund!
LoveSales - Find and save products you love, get alerted when they go on sale.
Slice Watch - Get an email when an item you've added drops in price 💸
TrackIf - Alerts you if the price of your favorite products drop
Gruupz - Get money back on every purchase you make on Amazon.
Giftwhale - Giftwhale allows you to create personalised wish lists online.