$16.64 amazon appstore promotion code with
Redeem it here:
3.) Promotion credit will be applied if you purchase a 50 Gem Pack (worth 33.28 USD) in Brave Frontier before October 28, 2014 at 11:59 PST. Promotion credit cannot be used for any other product.
[COLOR=Red][B]Thumb it down, report expired, this is false info even promoted by SD staff. This is only a deal for the above. Lots of people will get screwed thinking its a normal credit...it isn't!
Update: The in-app credit has disappeared for a lot of customers. Now you see it, now you don't.