There is a website called: Pe'ah http://www.peah.com/index.php
and they offer cards to use for educator discounts. I don't know if I'll actually order one through them, because you can go into any program from Word to Publisher and use a business card or label template to create and personalize your own.
Anyway, I have checked around and here are some places that offer Educators Discounts: Staples (sign up online), Bound to Be Read, Hastings, Barnes and Noble, Office Depot, Office Maxx and Jo Ann's. I am volunteering myself to call around and see how many places I can get to offer discounts to homeschoolers. Though, I probably won't get back with you guys with a better list until next week. The people who have gotten back with me, told me you have to go into the locations and speak to someone in Customer Service. I believe some places like Barnes and Noble might issue "Educator Cards." They also give you a list of what you can't use them for....periiodicals, etc.
Either, we can try to come up with some sort of group card.....easy to do in programs like Publisher (it has it's own logo creator) or use clip art, etc. and laminate them.....make our own individually....whatever.