Honestly, if you are going to try and get Duke tickets, I would say just do it on StubHub or something. That way you don't have to worry about the stress of finding a decent scalper price before the game and deal with all that madness. You aren't going to want to be in Chapel Hill, seeing all the people in Carolina Blue on Franklin Street and not be able to catch the game. The prices for the game tomorrow night are like $220 and up, but at least you can figure out exactly where you are going to be seated, have some options, and know that the tickets will be legit. If your stomach can take the stress, you can always try and hit the scalpers after the game has started. You might have luck looking on Franklin Street earlier in the evening. I have had good saints in the past sell me tickets for face value to some big games, but it is always hit or miss of course.
Just my opinion.