You would need an extra kindle or android device. Amazon has their own App Store you can side load on android or comes stock with kindle fire. Coins are a currency you can purchase to spend on apps and in app purchases. 100 coins = $1. They sell various levels of of packages with ascending discounts the more you buy. For example, you can currently buy 10000 coins for $82 which would cover your $80 preorder bundle and $20 tavern pass for a savings of $18. I carry an Amazon store card that gives me an additional 5% rebate on all my Amazon purchases, bringing my total cost down to like $78.
https://www.amazon.com/dp/B0096E8EPY?ref_=nodl_&asin=B0096E8EPY&ie=UTF8&denomination=10000
Amazon Coins can be used to purchase games and in-app items. 100 Coins are worth $1. The more you buy, the greater the discount! Here's a link to buy them: http://www.amazon.com/Amazon-10-000-Coins/dp/B0096E8EPY
And yes, you can use Amazon Coins to buy card packs. :)
Hope this helps! PM me if you have more q's.
-Amazon Tina
I don't see any mention of getting bonus coins back if I purchase 10K coins on Amazon.com
http://www.amazon.com/Amazon-10-000-Coins/dp/B0096E8EPY
Can someone confirm?
Is this supposed to be active yet? When I check on the 10,000 coins option it only saves me 12% at $88.