Not sure on how or if they ajust ticket prices at the last minute, but I would guess that you would be at a price disadvantage if you wait till the day of the contest.
Similar to hotel rooms here in town ...... Try to get a room on the weekend you need it at the last minute and you'll end up paying more.
I'd suggest that you simply call the Orleans box office and reserve your tickets now if the price seems right to you.
For further details go here --------> http://www.orleansarena.com/