In recent years there have been many changes to the way schools, sites, clubs, and events are afforded insurance to cover the inherent risks with this sport. As a result, school and instructor options have become more limited and expensive.
With this in mind it is paramount that you do your homework when researching where to do your training. Ask lots of questions, talk to someone at the school, talk to former students, look for instructors who have received the USHPA Instructor of the Year Award, and above all else: go meet with the instructor(s) you will be working with. Some schools even allow a day of training for free to determine if you will be a good fit with the system and approach that the school uses.
Regardless, be sure to look at as many options as you can before spending any money. Some of the best schools offer credit towards gear purchases when you do your P2 training with them - and you will definitely be needing gear as soon as you finish your training, if not before.