Jeanne Marie Hoffman of Le Chic Geek blog has reviewed the Honey browser extension, which will automatically try out its list of promo codes and insert the one that gives you the biggest savings.
Honey only works with the Chrome browser, so it won’t help folks using Firefox, Safari, Edge or Opera. And, Honey watches every page you visit. But, it can save you real money, and the more you buy online the more you will save.
The blog post also reviews the Ebates browser extension, which uses a different method to accomplish the same goal of saving you money.