Builders are always flexible... just like any other seller, they price high and then negotiate down.
I would caution you though, that even if you are working with a builder, you need to have a real estate agent representing you and watching out for your best interests and negotiating on your behalf. I don't have the information that you are asking about right now, but if you will contact me, I will dig deeper for you and get you some information on who the builder is and what their prices/specs are.
Let me know,
Keller Williams Elite