Welcome to 4x4 Earth. Sunshine spares are Archerfield should be able to help for pricing. I installed it myself, if not some shops will install it for you. ARB costs around $500 - 600 last time I asked.
Welcome From a Fellow Newbie.
I think you will find the Site and Users very welcoming and quite helpful.
I have been on two outings with some of the members and found them to all be great people, very informative and a pleasure to be around.