Writing workouts on dry-erase board, or something else?

I'm wondering what some other coaches use to post their workouts -- you don't need to be a coach to respond to this -- tell me how your coach posts the workouts. I've used a dry-erase board mostly in the past. But now that I'm coaching Masters, (instead of age-groupers) I would need to buy 3 or 4 dry-erase boards to use for each lane, since each lane is tailored for a specific workout. And 3 or 4 big dry-erase boards is going to be expensive. I've also used large notecards and Sharpie permanent markers to post workouts before. Then I stick the notecard on a kickboard and no matter how wet it gets, the marker doesn't run. I'm wondering if anyone has ever used overhead transparency sheets and a semi-permanent marker? (like the kind where you use rubbing alcohol to clean it off, not the kind that cleans off in water) Hope to hear some good ideas from you guys! ---swimandpedal