Hi there are you talking about the box which covers all the cords? If yes, its around $450.00
i think you will find this is free nbn (govement yes us )pays for the connection from street to yes the box with all the cords in it
you organise the suppler eg Telstra or any one else you choose) they connect you up
Quote from the NBN website
if the outside of your property hasn’t been connected to the
NBN yet, the free standard installation* will include connecting
a fibre optic cable from your street to the NBN utility box
installed on the outside of your home or business (also known
as a Premises Connection Device). The next step is for your
installer to drill a small hole through your wall and feed the fibre
optic cable from the outside into the NBN connection box (also
known as a Network Termination Device).
There will also be a separate power supply box which includes
battery backup that will keep selected phone services running
for up to five hours in case of power failure. You can find more
information on this in the FAQ section