Michael Schoch, Answers questions on Noodle
Unfortunately, I couldn't find any information on Phila Elwyn Institute. The number listed on its profile actually connects to St. Barnabas Catholic School located at 6334 Buist Avenue in Philadelphia. You can learn about the tuition fees for St. Barnabas on its website.
Sorry about the confusion. Hopefully this information is still useful. If you need, you can search for other schools in and around Philadelphia on Noodle. If you're only interested in Catholic schools you can specify that on your search.
Good luck and feel free to write back if you have more questions!