The following places offer rewards to teachers and none seem to have any strict guidelines as to who is a teacher and who is not.

Staples
Barnes and Noble
Borders Bookstores
Michaels Crafts (every Friday, teachers get 15% off)
Hancock Fabrics
Office Max
Ben Franklin Crafts
Pizza Hut
The National Park systems

http://blog.bradsdeals.com/2010/08/1...s-to-teachers/