I worked new home sales for many years and what was common was for certain upgrades to be included as specials or perhaps the additional appliances ( Refrigerator, Washer & Dryer). Builders aill also typically advertise all or some amount of your closing costs will be covered if you use their lender......although if you showed up with a pre-approved loan, you would also possible get those anyway.
I would suggest not to discount looking at resales either as you can get some good deals on them and they are more negotiable.
If I can be of any service to you, I have 21 years of experience helping people like yourself purchase homes in Raleigh and the surrounding Triangle area. I know you will love living here as my wife and I have since 1993. I may be contacted by using the information under my picture or through my personal website shown below.