The standard edition can be found here, and it currently has a preorder price of $60.99.
The limited edition can be found at this link, and it is currently set at a preorder price of $96.99.
As of this time, there has been no official announcement on the contents of the standard and limited editions. Also, with Zero no Kiseki Evolution’s release, there was a third set, known as the Chara-Ani box, which is what contained the Arianrhod nendoroid puchi. It is still unknown on the official capacity of all of the versions of this release, but it will probably be revealed soon.