Gopher - Better hotel deals automatically, every time + cash back
Paribus - Find out for free if online stores owe you a refund!
HotelTonight Escape - The best getaway deals for tonight (or the weekend)
Lolli - Earn bitcoin when you shop online
Slice Watch - Get an email when an item you've added drops in price 💸
Hotellook - Compare hotel deals from all the leading booking agencies