Can the person who evaluated you recommend someone? Philadelphia is pretty big, so it depends what part of Philly you're looking for. You may want to get some suggestions through the local yahoo groups: ASAphilly, TALKASAphilly, FamiliesOfAdultsAutism-ASAPhilly. There's also ASCEND, which has a directory, but I'm not sure if the directory (which has ads/professional listings) is only for members. I forget how much membership costs - it might be $35/year, but I'm not sure.
If you're near Bala Cynwyd, I've heard good things about Michael Friedman:
Michael P. Friedman, Ed.D., NCSP
15 Presidential Blvd., Suite 202
Bala Cynwyd, PA 19004
610-667-6269