Saturday's BMW autox at Mineral Wells is low on registrants. They offer 8-10 runs for $30, and almost always get done early (I usually get home the same time or earlier than a Lone Star Park race, even though Mineral Wells is 30min farther away for me).
If you aren't a bmw club member, you can still go just put in 123456 for your member number.
Registration link.
Course Map:
