The contest hat "Chair Racing Intern" came limited 25th Jul.
It's really rare with only 10 active Robloxians with the hat, this extremely gives the hat an advantage when it comes to selling.
As well As selling this hat most deficiently come in handy when the Trading System comes out.
So I highly recommend you to buy it if you have the money! I bought it and I'm enjoying watching the price rise.
I decided to take a screenshot when I bought it. Above ^
Anyway here's the link:
http://www.roblox.com/Chair-Racing-Intern-item?id=32199211
Hope this helped!
--TheJKid