I was browsing the NCDNPE site and found that they have added several helpful things, one of which is a homeschool discount card. Some businesses will give a discount if you can present a card proving you homeschool. So, instead of needing to get one from a homeschool group, you can now just print out your own from their site. Here's the link...

http://www.ncdnpe.org/registration/CreateCard.aspx