I just got 2 emails from Six Flags Great America, and Six Flags Over Georgia. Six Flags Over Georgia said they are supposed to have free parking, and I think the admission is still like kids prices. For SFGAm, they are having buy one, get one free.
I don't know what the other Six Flags parks are doing, but Six Flags is desperate for people.
Get Ready. Get Set. Spinout!
Six Flags America: The Park that is Full of Disappointments