It’s the Labor Day holiday here in the U.S. which naturally means that’s it’s a good time to shop. Retailers are buzzing about their Labor Day sales, with discounted prices and big cuts as they try to move the final remnants of their summer merchandise. If you’re planning on a shopping trip of your own today, here are a few apps from companies both big and small that can help you track your favorite stores and sales, and make sure you’re not missing any great deals.