Where can I learn cheerleading?

I'm really interested in recreational cheerleading, but I can't find a squad or even cheer classes for my ablility level and age. :( I'm almost seventeen, and I have never done cheerleading before. I used to do gymnastics, but all my tumbling skills are very basic (cartwheel, round-off, back-handspring with spot). I was wondering if there were any squads, teams, or even just classes I could join near southern Pennsylvannia? Thanks