Lowes website

At least in Firefox if you have the Greasemonkey extension installed you install the revised file directly the first time by simply viewing the source code in your browser and Greasemonkey will recognize it and prompt you to install:
https://github.com/wphampton/lowes-price-checker/blob/master/Lowes%20Price%20Checker.user.js

That direct link above is the equivalent of going to the GitHub site and clicking on the Lowes Price Checker.user.js file and then selecting View Raw.