There is an organization PEAS that I looked into a while back. They do all kinds of comprehensive evaluations, but are expensive.
Maybe consider calling some of the private schools admissions departments, such as St. John's, Kinkaid, Awty, the Village School, etc. and ask them who they use to do their evaluations for Kinder. I think some of them do their own, and most just use ISEE and Olsat for older students, but others use testing centers for the younger students that might offer more reasonable prices or at least lead you in the right direction.
