How to apply for Homeschool discount?

I am wanting to download some of the programs to teach my kids as part of their homechool curriculum. I read that I have to show proof of homeschooling (NOI and proof of purchase of curriculum), and that is fine, but where do I even begin to try to apply for those discounts/special pricing? How does this process work?

 Also, it is asking for "Current membership ID to a homeschool association", I'm not a member of any homeschool association nor am I familiar with any of them, but what might qualify as one, or can anyone give me a suggestion (I'm located in Arkansas, USA), or will my own "private" homeschool title suffice?

Thanks in advance