Looks like the Porsche Club (not to be confused with the BMW club
) is running a track day on Sunday the 9th at the OKC Sheriff's track off of NE 36th and Air Depot.
Last I heard it was like $35-40 (cash) to run. The required drivers meeting is at 10am sharp.
Their tracks tend to be very technical with a few areas to stretch your legs. The events are all timed and you get 8 laps (one at a time). The times I've run with them they seem pretty nice and easy going, but sticklers when it comes to their rules (fair stuff... like be at the drivers meeting on time). I'll be there, and I'll be ready for it to be cold. You'll need a helmet (they have a few loaners), and they have instructors that will ride with novice drivers if they want (which is pretty cool).
Here's the map and all that.