I looked at my RIP tour information from last year and for a non-private tour (4 hours in length) it was $150 plus tax per person, plus your HHN ticket ($74.99 per person plus tax). Private tours for peak nights (Fri, Sat) were $1800.00 plus tax per group plus your HHN tickets. They were up to 7 hours in length and are tailored specifically to your group. As others have said, tour information and prices have not been released yet this year, but this will at least give you an idea of what you would be looking at if prices didn't increase.
October 30th falls on a Saturday this year, so with that being a peak night, if you are unable to do the RIP tour, I would most definitely recommend express passes for everyone to ensure you get through all the houses. Express passes for the 30th are $79.99 per person.