Yesterday, we told you that Harry Potter eBooks were finally made available via the Pottermore Shop.

They are available for Amazon Kindle, but you have to purchase them in a way Amazon hasn’t allowed before. Behold, the power of J.K. Rowling.

Forbes notes the unique set up:

A little poking around shows that Rowling isn’t actually undermining her own effort, though — at least not in a major way. In a rare turn for Amazon, customers attempting to buy Harry Potter books through Amazon.com will find themselves in a new world as they go to complete their payment. That world? You guessed it – Pottermore.

Also of interest is the fact that you need to create a Pottermore Shop account to purchase after clicking the Amazon link. You’re not able to use your Pottermore.com account, either.

It’s an extra step for Kindle users, but, in the end, it probably benefits J.K. Rowling by requiring her to give less (or none at all) to Amazon.