As a ProAdvisor, you are entitled to 10 free returns (5 individual + 5 business).  You may also purchase additional returns at a discount, the rate of which is dependent on your ProAdvisor tier).  You may access these benefits under https://c38.qbo.intuit.com/app/proadvisor.

To redeem free returns, click on the "Get returns" button.  To purchase returns, click on the "Redeem discount" button.

The cost of each return is inclusive of both e-filing as well as state returns.  If you have already purchased credit to prepare a federal return, you will not need to pay extra for one or more state return(s) you may also prepare for that particular client.