I don't have a personal recommendation. I can't recall for sure, but I thought I saw a Deva stylist in Simi Valley listed on the Deva website. I know that's not TO, but it's not too far. I'll try to find the link.
Here's one in Thousand Oaks from the Deva website:
Jamie's Hair Design
Thousand Oaks CA
Brenda Frias - cut and color
Lissette Monagas - cut and color