Why Is Dirt Cost This Much?

Last week I posted something about Silent Hill 3 selling for over $50 on Amazon.con. Now, this week I find Dirt in my wishlist selling for $77.99. I can understand an older, last generation game...but Dirt is an Xbox360 game. And as far as I can tell, it is not a hard game to find.
 
P.S. I put "is" in the title because it was such a hit with the last post.
 

The typical Amazon error.

Once again, Hit Gaming is the only featured seller for the game, and they're asking for a ridiculous price

I bought Silent hill 3 at my local gaming store a few weeks ago for like 8 bucks. It´s was in the "trash bin" with other old ps2 games like onimusha and jak.

No offence dude, but 'why is dirt cost this much' maybe the greatest sentence I have ever heard.

It's probably hard to find these days. It's a cool game, though.  I picked it up for $30 like almost a year ago, but I wouldn't advise paying $80 for it. Dirt 2 is looking like it'll be a lot better anyway.