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"We all love free apps, but it's hard to track when apps go on sale, and whether they're worth the trouble. Here's a trick for keeping track of on-sale apps, and making those sales last forever. We've shared a few tools that help you track app sales, but they can be a pain. A lot of the apps that go on sale aren't very good, and while you can make a wish list, this doesn't help you discover new apps at all. Of course, we occasionally share cool apps in our Dealhacker posts, but what if you could get automatic email notifications for cheap, good apps whenever they went on sale? Here's a method-inspired by this Reddit post-to make that a reality."