If you go to the F1 listing on the CoTA site & click on Parking, Lot Q will show up in the TicketMaster List @ $60. I doubt if you wait, there will be any left in that lot & it will be more expensive if they make it one of the cash lots the day of the race.
I would go with T12, as there are no GA spots in that area. There are GA areas over by the bends. There is a good hill around 6 that puts you above the fenceline there. I have a post earlier in this thread with a link to my pics from the V8 Austin 400 race that a lot of the pics are taken from that vantage point. T12 will get you good views of the straight, T12 & the T13-15 complex. I’ll be in the T15 GS’s.
Last year, prices of the closer in hotels started coming down as the race got closer, but I don’t know if that will happen this year as there is a home UT football game that Saturday. You might look at hotels in Buda for availablility. Would be much more convenient as you can get there by using the 45 & 130 tollways. Without traffic, it’s a 12 minute drive. If you got parking in ‘Q’ you could even use SH 21 to get there & miss most of the raceday traffic. Lot ‘Q’ is basically at the SH21 & FM812 intersection. The city of Buda actually had a shuttle for hotel guests last year that picked up & dropped off at the hotels, but not sure if they plan on it this year. It was pretty popular last year though. I say city loosely though….we only have about 2000 residents.