Need consulting help with Non profit Association accounting

We are a software company that provides software for membership organizations and associations. Mainly non profits.
We need to integrate our software with accounting package.
We need an expert accountant who worked with this kind of organisations in USA and knows the rules of how typical transactions such as membership sales, event ticket sales, product sales and donations should be registered in accounting software.
We will also need to understand the tax rules of these operations.
Please suggest your rate as we are not sure about it. Looking forward to hear from you.