Alongside the launch of its Amazon Coing digital currency today, the massive etailer announced a promotion to give away 500 free Coins – by way of a discount – to every Kindle Fire customer. The $5 coins can be used to buy app and make in-app purchases. To redeem the full discount users must buy 10,000 coins at $1 per coin with a further 10 percent discount, making the total cost $90. [Source: VentureBeat]