There's an App for That
With over one million iPad/iPhone apps (October 2013), it is impossible to keep track! One day an app could be free and the next it could be full price. There are many ways to find free apps.
See what’s APPening in education (Microsoft)
Kathy Schrock's Guide to Everything
Teach Thought: 55 Best Free Education iPad Apps
American Association of School Librarians
Apps to help you find apps! AppShopper, AppTracker, and Apps Gone Free.
Pinterest and Twitter are great places to find apps!
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