Where can I get a scratchy texture like the one on xoxmariah.com?

Check her credits page, that shows the sites that she used to get textures, and brushes from for her site. It's most likely on there where she got her textures from:

http://xoxmariah.com/wp-content/site/credits.php

http://peoplemachines.livejournal.com

she's famous for them.

thanks