Currently, Microsoft has also launched 3 promo SKUS for Dynamics 365 for SMB customers, which are:
The promo SKU is available for ordering through Prime portal.
Microsoft will make a second price point available for Dynamics 365 for Sales for SMB in Spring 2018. The capabilities of this second price point for SMB is expected to align closely with what is called Dynamics 365 for Sales, Business edition today.