AStylus Micro Headphone Jack Stylus
This is the world's smallest stylus which is designed for one purpose - keeping fingerprints off of your device, or a quick draw on the display of a tablet or smartphone. Essentially this is a stylus tip added to a small piece of plastic that fits snugly and easy into your 3.5mm headphone jack. It's extremely simple to use, won't get lost, and is extremely cheap. Give one a try today.
$1.99 from Astylus