You won't find a cheaper event than this at Blackhawk this year! They kept pricing the same as it has been for 5 years now!
Link to event details here: http://www.myautoevents.com/pls/mae/frmEventDetail.Show?psevent_id=12903
If you have a comp license, you can run in group 4 (the open passing race car and gear required group)
I ran this once (I was in the open passing race group) and it was a woot! 2 friends of mine were there too and everyone had a great time!
If you are looking for another track day on a budget, this could it for you!