I have recently registered at least 10 clients at DR Horton, Standard Pacific (Piazza and Castello), Taylor Morrison, KB homes, Brookfield Homes Winwood and Mariposa at Jordan Ranch. Believe me, all the builders are increasing their prices $25-30K every two weeks in some cases.
Dr Horton prices were the most reasonable in that area and the demand was very high. The builder is using that demand to their advantage and raising the prices more than the other builders in the area.
Standard Pacific will be building more home is a new development in Dublin in May of this year. The starting price will me $700 K+.
Make sure you take an agent with you so they can register you there. If you have not registered at other sales offices, please take advantage of what your agent can provide you and register with an agent. The builder will pay your agent a commission so it costs you nothing. I give my buyers a lot of inside scoop on how much the homes are going up in each phase, what the whole neighborhood resale homes are going for and if it makes sense to buy in that development. By getting an agent you have a lot to gain and nothing to lose.
Pacita has answered your primary question; however, you may find the following of interest as well:
"Why You Do Need a RealtorÂ® When Buying From a Builder"