I tried to haggle down scalpers from 30 minutes before to 15 minutes into the Iowa/Minny night game in 2015. They refused to drop their prices and were just going to eat the tickets because no one was willing to pay. I wish I could remember how much it was but I can't recall. The only people selling were the "pro" scalpers and they were willing to take the hit on the tickets they had left. I'm guessing everyone actually going to the game had sold their extras throughout the day while tailgating.
Different situation as we were undefeated later into the season and a top 10 team but I told myself I would never wait last minute and scalp a night game again. Luckily, I had a backup plan and just met up with friends at the bars and watched the Hawks win!