I guess it’s handy to share this since we’re all shopping these days.
There’s a Chrome extension called Honey that’s really handy. Go to your checkout - Honey will automatically detect a promotional code entry box and create a little yellow button. Click the button and it will use its database to plug in a good chunk of promotional codes. If it finds several codes that work, it will calculate which one saves you the most money, then tell you how much money you saved!