https://images-na.ssl-images-amazon.com/images/G/01/vg/varia/varia-us-terms-and-conditions-2017.html

So no more discounts on Amiibo, and CE/LE going forward. It doesn’t matter if an LE version is the only version available (Ex: Senran Kagura Peach Beach Splash Edition does not have the discount besides the fact that this is the only edition available).

Also, the discount will only apply to preorders. No more two week grace period.