RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.

FS Labs - Fuckedup Startups provides failure analysis of a start up business while providing a forum to communicate with other start ups.

Slickdeals.net - Slickdeals: The Best Deals, Coupons & Discounts on everything

Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.

DontPayFull - Verified coupons and discounts for a variety of online retailers.

Groupon - Each day Groupon offers a deal through local vendors in your city.