Hey man, I'm surprised nobody has replied to you yet. If you're looking for new, we carry quite a few different types including the Amuse you mentioned.
We can get you a good price being a member on the forum. I am not entirely sure if they come painted but if they don't, the money you'd save buying from us you can get it painted yourself.
Here's a link to our bumpers:
Vivid 370Z bumpers
Let us know if you'd like to know more!
-RyanG