QuickBooks Online offers three options to purchase.
- Simple Start
As of June 2018, the pricing is $20 (QuickBooks Online Simple Start), $40 (QuickBooks Online Essentials) and $60 (QuickBooks Online Plus) per month.
As your business moves forward, you can opt to upgrade or downgrade your plan.
If you want to track inventory in QBO, then need to purchase the Plus version.
If you are a non-profit you probably want a copy of the Plus version so you can use the Class tracking feature. TechSoup offers a $50 price for the entire year for copy of a new QuickBooks Plus version.
If you are a business coach then you can go with the Simple Start or Essentials. There are better reporting options in the Essentials version and even better in the Plus version.
Here is a page with the current pricing models from Intuit.