Hi mate,
How bent is yours? In some cases (and depending who is doing the repair), it can be straightened.
You may be better off sourcing a used white one, I dont believe it would be hard to find. I suggest this as it would just look alot more genuine in my eyes because when you replace it, you will obviously have to paint it - etc. Which would not look ideal and may be an obvious sign of front end damage if you were ever to try and sell the car.
If you do want brand new genuine Nissan, you would most likely have to go via a Nissan direct dealer which supplies import parts. Nissan at Prospect does this, however it would most likely be ex Japan so there would be a wait involved.