I just followed the link to Bondurant and saw it offers an autox driving school, but it cost a crapload of money (no specific price, but using the $500 to $1000 filter locates the autox school). Since I thought the 3 day HPDE school was great, I would recommend Bondurant to anybody - except for their autox school.
Our school
http://www.azsolo.com/forums/index.php?showtopic=12244 costs much less than their school. We have a bunch of instructors who autox at the national level and do very well. Last year, we had six national champions instructing, and two of them instruct for Evolution Driving School (which focus on autox specifically).
Our school is on Dec.1st. all entries have to be prepaid via snailmail.
Space is limited, we typically sell out for the school, so registering ASAP is a good idea.