Supply Finder by Popcart - Find toilet paper in stock online right now
Shopper.com - Uber for Coupon Codes
Syncerize - Effortless Product Import, inventory sync, and order update
InStok - Check product availability and prices in stores near you.
OctoShop for Chrome - Compare prices and get alerts when things are back in-stock
Web App Meister - An advanced comparison engine for web apps.