1) Find a reputable shop, specifically search for powder coating. Most of the good ones only do that.
2) Should be $200 or less per wheel, $150 is a pretty standard going rate.
As mentioned above, BE SURE to ask them about doing forged wheels if you're doing the 20" wheels. It requires...
There is a black translucent powder coat that can replicate the black chrome look. They will sometimes spray with a chrome powder base layer first, but I'm curious how it would look with the native machined surface of the bright underneath.
Limestone with FE is a highly recommended option by...
Can't remember where I saw it, but someone reported that they could replicate it by doing something while in reverse.
Just an FYI, and please post details if you can replicate.