As far as I know the only blood ball cross was to normals and was far as price I could not tell you as I haven't had any interest here is the guy that first did it I think.
http://www.roussisreptiles.com/colle...lls/super.html

He has some listed as Mongrel which are super ball bred back to a ball so you have a 3/4 ball, 1/4 blood.
http://roussisreptiles.com/available.html