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Did a quick search and a post for this app didn't come up. Thought it might be worthwhile posting since people make individual posts when apps price drop.
Basically they list apps that have gone free and they list them on a daily basis. The good thing is that all the apps they list are a minimum 3 stars, aren't regularly free and don't include outside ads.
I've gotten a few useful apps myself so it's definitely saving me dollars.
Cool post op, Not an ios user but helpful for those who are.
Android equivalent is called appsales.
I've gotten a good few apps on sale through them.