Costs vary from school/chapter-to-school/chapter! Penn State sororites do not have houses, which does help keep the cost down!!!
I assume you know this... but here are a few wonderful links to Penn State's Greek Life.
http://www.greeks.psu.edu/panhellenic/index.htm
http://www.sa.psu.edu/greeks/
http://www.sa.psu.edu/greeks/SP01PHC.shtml
There are 21 Panhellenic Chapters at Penn State... Which almost covers all the members... Each chapter is represented here on GC and I can comfortably speak for all.. We are here to answer any questions you might have!!!!!!!!!!!