A customer who needs more than 25 Sales App seats can purchase additional 25 Dynamics 365 for Sales and Customer Service, Enterprise edition seats at US$65/AU82.80 per user per month. If a customer needs more than 50 seats, the customer would need to order the Dynamics 365 Enterprise Edition SKUs with standard pricing. The SMB promo SKUs cannot be ordered with other standard pricing SKUs. Please check the terms and conditions for the SMB promo in this FAQs for more information