Make it clear from the parent screen how to purchase new modules.
There is no easy clear way to purchase new modules from the website. I can see the Curriculum map, but no purchase options. At least give me a link to the App Store from here. A list of all the purchasable items and who they are appropriate for would be great. I shouldn't have to go to the App Store to see that.
We are working on a new solution to allow parents to pay for our website.