Ibodel - I hear ya on prices dropping as you get close to the event. I went to the Des Moines Session 2 last year (IU & UK were each playing that night) and paid only $35/ticket (plus fees) for lower level tickets an hour before tip. Those tickets had been north of $200/each all week, but fell dramatically day of game. But, every situation is different. For that Session, there were over 500 tickets listed for sale on StubHub the day of the game. For tonight's game, there is less than 100. And, while i didn't look at every listing two days ago, the vast majority were listed as "pickup" and not "UPS" for delivery, so I really do think they were actually purchased and not withdrawn due to shipping timing issues.
As an aside, I went to the game on Thursday, hoping to buy tix cheap like i did at Des Moines last year. Lower level prices came down marginally, but a pair was generally at least $150/ticket with 30mins before Session 2 tipoff. So, I ended up in Upper Level because I'm cheap. Based on my viewpoint, it certainly seemed that ISU was the driver of prices staying elevated. You could get a Lower Level pair to Session 1 for $50/each, by the way.
Could prices come down as we get closer to the game - of course, but I wouldn't be counting on it. I truly think most tickets have settled into "buy and hold" hands, not "fast money" speculators. But, as the great Ted Dibiase said "everybody has a price", so maybe some of those ISU fans will be willing to sell, but I would think it will be at a high price.
I hope any Purdue fan that goes tonight scores a great deal. The point of my post is that you shouldn't make the drive with the expectation that a deal will be had. Be prepared to pay up if you go, or just be willing to walk and watch it at the local Purdue bar. Good luck to everybody going tonight!