You should start to use the search function of this forum. There are already a few different threads about aurora. THIS ONE
is very informative and should answer most of your questions and give you a little history on it.
As for cost, it depends on how many pieces you want done and how big they are. From what I've heard, an accent kit for a gun can be nearly $1000, while the whole gun can be anywhere from $2000 to $3000, or more, depending on where you have it done.
There was a thread a while back where a group of people were trying to save money on the process by having a large number of markers done at once. I don't know if it ever happened or if they are still looking for more people.