Erm... this just sounds fishy... I'd look else where!
A Pastel X Pied....Just because it has the "markers" doesn't guarantee it to be a possible het anything. I have normals that have the "pied markers". I could be a scum, write up some phony guarantee with a phony made up pedigree and sell my normals for a few hundred bucks saying they are het pieds and vanish into the wind.
A reputable breeder isn't going to be selling any animals on a "craigslist" type of site.
Pat is right, that snake is very skinny!
I'd get a %100 het pied female from a real breeder and not some joblow from a a strange site.