The majority of VetFolio's content catalog is included in the annual subscription. Some items, however, are a separate charge. These items can be purchased in addition a subscription, or independent of a subscription. Premium Content can be found here, or in the catalog. All items are clearly marked. If you wish to purchase premium content, log in to your dashboard, then locate the course and pay to enroll.
If you're purchasing on behalf of another user, please see the help article entitled "Can I Gift a Course to Someone Else?"