New codes will be put out regularly during pre-release. These codes will allow you to register a completely free Arillio account. Other than the starter pet, these accounts come empty.
There are no available free codes at the moment.
You can buy an Arillio account at any point during pre-release. You will receive a unique register code to your email that will allow you to register an Arillio account. These accounts come with 500 Gold in addition to your starter pet.
If you have trouble receiving your code, email email@example.com.