Ya, you can use just about any screen protectors. The iPaq screen protectors will be too large. Any screen protector for a PocketPC with a 3.5" screen will do perfectly. You can even make your own if you want.
Or you can order some from
http://www.ppctechs.com Just measure your screen, height and width, in mm, then look on that website to see which kind fit best.
[edit], I just looked on that website and they have axim screen protectors, measurements: 55.7mm x 73.5mm (w x h). Any other screen protector you find with a smaller width and height and it will fit right on. Or just order from them, they're nice and reliable.