I find this a useful app for android devices.
It catches many of the apps which have been discounted, as well as including a price history of that app over the past 60days.
https://play.google.com/store/apps/details?id=net.tsapps.appsales&hl=en
It catches many of the apps which have been discounted, as well as including a price history of that app over the past 60days.
https://play.google.com/store/apps/details?id=net.tsapps.appsales&hl=en