On March 1St, 2022, Microsoft will be raising Microsoft 365 prices for the first time in 10 years.
The commercial products that will be affected are: Microsoft 365 Business Basic (from $5 to $6 per user), Microsoft 365 Business Premium (from $20 to $22), Office 365 E1 (from $8 to $10), Office 365 E3 (from $20 to $23), Office 365 E5 (from $35 to $38), and Microsoft 365 E3 (from $32 to $36).
Please see this link for additional information around Microsoft price changes
https://www.microsoft.com/en-us/microsoft-365/blog/2021/08/19/new-pricing-for-microsoft-365/