RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.
TurboSquid - TurboSquid offers 3D models for professionals.
Slickdeals.net - Slickdeals: The Best Deals, Coupons & Discounts on everything
STLFinder - The 3d models search engine.
Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.
3DOcean - 3D Models & Accessories From $1 for 3D Models, Textures, Materials & Shaders, 2D Concepts...