I have about 300 dollars and don't know what to spend it on?

I was thinking about an iPhone but the service is a bit out of my range. Then I was thinking about a small HDTV but can't find a sony 1080p for that size. Now I am thinking of investing into astro a40 headphones for my ps3, but I dont know for sure yet. Can someone please tell me a usefull ps3 related item that I can get for 300 dollars. This would really help. Please dont tell me to save it up... I have been. Your input could seriously make me buy something great, and I would greatly appreciate it. BTW I am 15 and don't need a car because my dad gave me his old one. Thanks!