28 CFR Part 36 Nondiscrimination on the Basis of Disability by Public Accommodations and in Commercial Facilities NPRM (2008 Title III NPRM)

(7) Ticket prices. The price of tickets for accessible seating shall not be set higher than for tickets to seating located in the same seating section for the same event. Accessible seating must be made available at all price levels for an event.  If an existing facility has barriers to accessible seating at a particular price level for an event, then a percentage (determined by the ratio of the total number of  seats at that price level to the total number of seats in the assembly area) of the number of accessible seats must be provided at that price level in an accessible location.  In no case shall the price of any particular accessible seat exceed the price that would ordinarily be charged for an inaccessible seat in that location.