Yakult is not sold in Philly. It is sold at some stores in New Jersey, but they aren't very close. I suppose it depends where you are whether you consider the stores to be in the Philadelphia area.
Asian Food Center
660 Plainsboro Road
Plainsboro , NJ 08536
Asia Supermarket
700 Black Horse Pike
Pleasonton, NJ 08232
Great Wall Supermarket
3151 Rt.27 Unit A
Franklin Park, NJ 08823
Asian Food Center
660 Plainsboro Road
Plainsboro , NJ 08536
Asia Supermarket
700 Black Horse Pike
Pleasonton, NJ 08232
Great Wall Supermarket
3151 Rt.27 Unit A
Franklin Park, NJ 08823