[DAMotorsports]

You can also look into nasaproracing.com. They do HPDE at all of their events and in level one they provide an instructor for free. SCCA auto cross and track events are also a good starter.

I've have ran with several different groups and ended up sticking with NASA because of the free instructors. They have a yearly members of $45 which includes a year membership to grass root Motorsports. Then most of the track days were 140 per day with instructor.