Xbox 360 Internal Hard Drive 250GB
Yes, I got it for my 360. It's an internal hard drive (not external) so it goes inside the compartment for it.
So I recently did buy the hard drive, and it works tremendously. If it does say that she needs a hard drive to play those games, I would get it. I got the hard drive because I needed more storage for game memory, and it works great.
They probably can if you are in the U.S.
I bought mine for $30 so I'm guessing they'll buy a used hard drive for $10-15. Just an educated guess by looking at their game prices vs. trade value
It looked just like the picture in the listing. I put mine in a 360 Slim and it is working great. It slid right in with no problems.