Hear the sounds of stealth with Astro Gaming's Metal Gear Solid: Peace Walker headset
If you want the sides of your head to bear the Peace Walker logo (and if you also want to hear sounds and stuff), you can pick one of these up for $150. You can also add $20 and get a downloadable boxed copy of the game, which is probably something you want, considering that you're hypothetically going to drop crazy bucks on a headset with its name on it.
[Update: corrected the bonus offer: $20 gets you a retail, packaged copy of Peace Walker.]