I'm an eighth grade science teacher and use the overhead projector in all my classes, since we don't have our own rooms. I'm sick of using overheads that don't come all the way clean (the Vis-A-Vis markers leave shadows), and I'm looking for an alternative to transparencies. Sometimes we use it for just taking notes, and sometimes we're filling out a worksheet on the overhead. Do you have any suggestions on something (cheap and reusable) to use other than transparencies, and what kind of markers (Vis-A-Vis or Expo) do you use on them? I've heard about clear dry erase boards, but haven't been able to find those. Help is appreciated!