The first generation (2011) tablets don't have access to the new coin balance feature, explained below. (lovemyfire.com)
If your starting balance was 500 coins and you bought an app for 99 coinns why does your screen show the revised coin balance at 392 instead of 401? (goodereader.com)
The Amazon App Store now has a new little popup bar at the bottom right of your screen that shows your Amazon coins balance (here are my 500 free coins): (lovemyfire.com)