Christi asked where I got 30 white board for $15. Simple! I got a piece of shower board from Lowe's and had my father-in-law cut it down for me. He actually bought 2 sheets and cut about 48 12" x 15" boards. I took 30 and my mother in law took the rest.

They're great and really inexpensive! If you don't have a father-in-law to cut them for you, the store will do it, but they usually charge per cut. However, it's still cheaper than buying white board from any of the school supply catalogs.