Uhhhh, I'd be worred about some breeder selling me a high dollar snake that is already pregnant. For one, why would said breeder be throwing away all that money from babies, especially a high dollar morph. Second, depending how pregnant she is, that might not be the best idea to be shipping her by plane with all that stress. That just screams slugging out or complications which worst case, could end up with a dead mama.
Also i hope you have a rack with heat tape and t-stat all set up along with an 80F room to keep them in as flexwatt wont heat the air so you will need a warmish ambient temp room. And i hope you have a supply of F/T fuzzy mice ready lol.
Also make sure you get some kind of written proof from the breeder as to their genetics. I for one would never drop that much cash on a no name breeder(you) for said babies, no offense. I know paperwork can be faked, but having it offers at least something better than just your word when trying to selling $2000+ babies lol.
To me this whole deal sounds kind of fishy and i would be very careful about throwing down your cash for said snake.