Are you interested in something different? Dirt Runner, a permanent facility located just outside of Chicago, offers some wild events including:
-DRX Games (OCR without the running)
-Midwest Mayhem and Warrior Rush (traditional OCRs up to 5 miles in distance and time variants including 6 and 24 hr versions)
-DRX Brute (a hybrid strongman/OCR event)
Check out their event list with prices so low that no discount is needed.