Wow, I get to be the first to review Rio Salado, a divey 9-holer near the Tempe-Scottsdale town line which is a bit of a step up from nearby Coronado as far as dive courses go. Don't know if they still have this policy, but when I was living there this course was FREE if you wanted to walk mid-week before 2pm during the summer. Sure, its about 120 degrees, but free golf is free golf.
There's nothing spectacular about this place, but it's realatively cheap and usually easy to get on and not crowded.