The Cassandra Lynn is from a subset I call the Naughty Nurses. I pulled a Melissa Riso of that type. I'm not sure how rare they are, but if you pulled 1 from 10 boxes, they probably are limited.
My Sketch Card Collection: http://www.sketchcollectors.com/gallery.php?user_id=39
I am a network admin. If you see me laughing, pray you have a recent backup.