As a recent econ grad with too much free time, I wanted to build a tool to help the e-commerce community. I built Unit Demand -- it's an online platform that lets you find the price sensitivity over your catalog of products, serve dynamic coupons to price-sensitive customers, and get pricing suggestions based on price elasticity (a popular economic metric). You can find it here -> https://www.unitdemand.com It's in beta, and it will be free for a long time while I tweak it. I'd love to get feedback on it. It's super easy to install, you just Unit Demand's <script> tag to the header of your website's pages, much like Google Analytics. The only limitation is that it tracks up to 5 products to keep server costs down, but I plan on upgrading that to 20 in the near future. Cheers!
I have had the <script> tag on ALL of my thousands of pages for YEARS, and NEVER once have I ever gotten Unit Demand feedback.