In celebration of their 30th birthday, Diesel has decided to fuel madness among those who crave cheap designer jeans. On Friday, Oct. 10th, at what looks like 10:30AM EST, a limited number of "Dirty Thirty" jeans will go on sale for $50 online. A few stores will also carry them, and I know the Diesel in Union Square is one of them. (They have a sign on the door.) If you want one, go early (like, very early).