RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.
ONE:NIGHT - Last minute reservations at only the best hotels
Slickdeals.net - Slickdeals: The Best Deals, Coupons & Discounts on everything
Sponstayneous - It's like Scott's Cheap flights, but for Airbnb's.
Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.
Hotel Room Alerts - Snag a room at a sold out hotel