Newly constructed Condo purchase for a non negotiable fixed price?

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Hi BP family!!

We are trying to buy our first ever property for primary residency.

We visited newly constructed condo town (more than 250 units) today and found a charming unit. But the sales person said the price is fixed and non negotiable.

Is it common for a newly constructed condo?

Here are some details.

1. Area: Boston Metro

2. We pay 5% now and pay 95% at closing. The unit is still under construction and expect to be completed September/October 2015.

If we hire a realtor, would we able to negotiate purchase price?

Thank you for reading my post.

Jay