I'm going to give you a bit more than you asked for, as some things have changed since 2010.
First - If you are planning on tailgating in the lots, pedestrian gates do not open until 830a. You can bring coolers, chairs, heck probably even a couch in with you - as long as you have a gameday ticket or tailgating pass.
The hotel at the corner of Kirby & westridge south of the stadium charges $20-$25 to park.
There is a new offsite parking that has a shuttle located on the eastbound feeder of 610 near Kirby. I think the charge was $10 - not sure, because it just appeared at the last game.
You can park anywhere along the rail line and catch the train for free. Consider parking somewhere between the stadium & downtown close to a stop - The museum district for instance. http://www.ridemetro.org/Services/Ra...ed_parking.pdf