MichaelNZ:
Speaking for myself, I would not consider an install cost in the 5-figures to be unreasonable.
It's where this is at within the range which is absurd.
Everything that could be covered in this thread has been. The costs aren't excessive for what you are wanting.
I will however point out that this is NOT expensive for a NGA on request application - I've heard of many installs well into the 6 figures.