I needed a way to post assignments for my students to cut down on the time wasted answering the questions: 'What did I miss when I was absent?' or 'When is our next test?' I bought a sheet of white tile board (4' x 8' paneling for kitchen and bathrooms) and cut it in half (share the other half with a colleague). This is an inexpensive ($10) answer to the white board that uses dry markers. I made a grid on it with black tape. I write my different course assignments for 10 days. Since the board is large and can be seen from anywhere in the classroom, it cuts down on traffic in the classroom and keeps everyone informed of what we have been doing.