I'm not sure which production you are referring to specifically so I can't help with that.
I can speak to the high cost of putting on a Disney in Concert. I work for a small civic orchestra and we are producing Disney in Concert for our audience next month. We did not raise our prices above what we normally charge for a concert, but if someone asked for a discount code, I could not give it. We are probably just going to break even, and we are doing one of the older productions.
I know this doesn't really help, but I thought it might give you some insight if you can't find discounts. It's wonderful music, of course. Often sponsors and local media are given tickets that they will in turn give away, maybe you can find one that way?