C.B.
Here are some places we've been. I think they all have birthday party packages to choose from, and most of them seem to run coupons off parties in those coupon books that are around. I've listed them in the order that I'd take a two-year-old:
Jumpers Family Fun Zone in Newtown Square -- loads of bouncy castles. http://www.funatjumpers.com/
Kehler's Gym in Broomall -- indoor playground plus loads of other stuff. http://www.kehlersgym.com/
Oasis Family Fun Center in Glen Mills -- indoor playgrounds with video machines and more. http://www.oasisfamilyfun.com/
Good luck!
C.