If that's not good enough for ya, you can build your own!
Not criticizing or nuthin, but .... is it just the viewing angle or is that track not centered through that portal?
As for customized equipment sales ... I had some UP COLA domes where I opened up the dome floor so the installed light kit lit up the dome and the car. Then I painted the interiors and added some passengers. The obs went for $90 on eBay, the other domes sold variously from $50 to $75 each. It probably is not only the work done but the popularity level of the road modeled that determines price.