A DIY alternative to Screen Protective Cover!

Instead of buying a screen protective cover for the screen of my Pocket PC, which generally costs between S$5 and S$1o per piece, I have been using my own DIY idea, i.e. cut out from a piece of Overhead Projector transparency a size slightly bigger than the screen size and slide it into the four sides of the screen. That's it. It saves money and works equally well. For four years, I have just replaced the transparency once or twice. By the way, one piece of A4-sized transparency costs just around 3o cents.