As far as I know, Chicagoland has never sold individual tickets. You have to buy their 'Track Packs' which include the Busch race & Cup race in July, IRL & ARCA races in September. If they have ever sold them individually, that would be the first I've heard of it. Last year seemed to be the first year that they were sold out before the season started, but in the past they have always been sold out by this late in the racing season. During the Atlanta race this past weekend, they were still pitching the 'Track Packs' for this season...so obviously there not sold out as of yet.
There will plenty of scalpers from the time you get off on I-80 until you get to the track. Try E-bay, but you'll probably be paying about the same if not more? I've never used E-bay, but I've tracked race ticket prices on there before.
Coming from the North, the traffic sucks! I-80 will be a parking lot pretty much from I-55. Either leave really, really early, or drive south of the track and back track. Pretty bad for a track that only holds 75,000. Michigan holds more than twice as many people and I usually have an easier time getting into that track.
No coolers or carry-ins (food). Can bring in a scanner, but either it has to be in a clear bag or a camera case type of bag. Bring lots of $$$$, everything inside is pricey! Another thing that always bothered me down there is that they let beggars run through the parking lot trying to peddle crap, asking for donations from $2 to $10. I've seen it at some of the other tracks I've been too, but not to this extent.
I wasn't too impressed with the seating either. Viewing the whole track from every seat is great, but if you're over 6 feet tall, there isn't much leg room. Not good for a newly built track IMO.
This will be the first time since they opened the track, that I won't be going to the races down there. I'm just tired of all the rhetoric.