Getting ready to download Hearthstone onto your Android-based phone? Back up. The Amazon App Store is running a promotion by giving away Amazon Coins with certain in-app purchases. In fact, Amazon has a page dedicated to Hearthstone deals.
You get 30 percent of your expenditure back in Amazon Coins so that you can put them towards more in-game purchases, basically.
What this means is that, if you’re spending money in the game anyway, doing it through the Amazon App Store gets you more Card Packs.
The example we were given by Amazon is this: if you spend $90 then you get 106 packs on the Amazon App Store, whereas you’d only get 70 packs for the same price on Google Play.
Via Pocket Gamer