Hi @ajn. Yes you have to purchase the roof bars yourself. I bought roof bars and Topbox for my Hyundai Tucson online. I found the price of roof bars from a main dealer were expensive, As Wigwam has said you can buy them from Halfords who will fit them for you or look online to see if there are any special deals. They are straight forward to fit.
I have always used Thule Roof Bars for my cars but there are cheaper options.
Any Questions feel free to ask.