You can sign up for QBO for Accountants free of charge.

Once your account is established, you would then have free access to QBOA for your own firm, collaborate with your clients who use QBO, and offer wholesale discounts for QBO.  There are also basic training materials you could use to get certified as a QBO ProAdvisor and for CPE.  QBO ProAdvsiors at Gold tier and above are also entitled to discounts for ProConnect Tax Online.

See this link for more info: https://quickbooks.intuit.com/accountants/proadvisor/?cid=ppc_G_e_US_.ASG_US_GGL_Brand_Core_Exact_Se...