Just put on one called "XtremeGuard". I had one from the same seller on my Moment and it is the best screen protector I've used on a device. You can hardly tell it's there, and it is slick to the touch unlike many I've used. These do require some soapy water to apply. I tried without water on the first one, and once it sticks to the screen when dry it doesn't come off without stretching it beyond use.
here's a link, it was $3.99
XtremeGUARD Samsung Epic Clear Screen Protector Cover - eBay (item 320588313347 end time Nov-08-10 16:18:25 PST)
Some reviews from xda
XtremeGuard screen protector - xda-developers
Xtreme guard protector screens - xda-developers
Well worth the money IMO!