Howcast's video guide details how to make a screen protector for free by using materials from around your house. You've got no excuse for scratched up screens on your gadgets.
All you need is a ruler, permanent marker, clear packing tape, scissors, a bowl of water, dish soap and a credit card. First measure your screen, then measure the packing tape to fit and add an inch. Cut the tape straight, and hold the tape up by the extra inch to prevents fingerprints. Then drop the piece of tape for a couple of seconds in a bowl of water with a little soap in. (Don't make it too sudsy!) Put a drop of water on the screen, and apply the tape. Smudge out any air bubbles with the credit card, and finish off by cutting off the excess tape at the bottom.
While the video shows a mobile phone as an example, the method could be applied to any of your gadgets. Keep in mind the width of the packing tape is a possible limitation. Ever tried this before? Let us know how it worked for you in the comments.