North-Aire and Sheble's
North-Aire and Gladys Morrison have been around forever. I recall that quite a few disaffected Riddlers switched over to her to get their ratings. Also, for some reason, the local examiners seemed to treat non-Riddle students better than they did Riddlers.
Custom Pilot Service is another Prescott alternative that has trained a lot of pilots.
One thing about Sheble's is its ability to get people finished fast. Joe Sheble himself was the examiner when I went there for my ATP in 1989. I would bet the ranch that it has an on-site examiner for CFI.
Good luck with your training.