The testing location I was going to recommend closed last year, after operating for 50 or 60 years. However, you should easily be able to find someone to test (don't know about price) if you look at lists provided by local private schools.

Many private schools in the Philadelphia area require WISC or similar for admissions for younger kids, Here is one such list (first on the list is the closed location): https://www.baldwinschool.org/admissions/applying-to-baldwin/lower-school

I agree with others that this probably won't help with your local public school. Our public school insists on doing the IQ test themselves, and they choose which test (because they want to make the process as difficult as possible, and don't want to help the kid).