I used to sell Thule, Yakima and other racks and more than 10 years ago they retailed for between $45 and $80 depending on size and company. It would not surprise me if they were over $100 now, but $200 seems excessive.
It would be very easy to make one out of either plastic, aluminum or steel and if you look at the way the Thule or Yakima ones are mounted it is very easy to duplicate. You can use door molding or similar for the rubber between your fairing and paint.
My intent would be to make one that was strong enough to handle the brush it sees on the trail.
if you really do not want to make it, look in your local paper, e-bay, and other used places there are always roof racks for sale. I would be shocked if you could not buy one used for $25, $50 absolute max.
Michael