All Azure and Office 365 tenants come with a free version of Azure AD. To gain access to premium features such as MFA, Conditional Access and Identity Protection, you have to procure Azure AD premium P1 or Azure AD Premium P2.
Azure AD and Azure ADDS are available through Azure CSP program.. The latest price can be obtained from the Azure pricing calculator or by contacting the rhipe sales team. Reference https://azure.microsoft.com/en-au/pricing/calculator/