$600-$700 may be rather too low a rental price for a 2-bedroom apartment in the area you're looking for. There's nothing listed on the Multiple Listing System right now except for houses for rent, in a different price point ($1,300 +), but if you go to http://www.apartmentguide.com,
you should find the Governor Mifflin Apartments, at 100 Colonial Drive in Shillington (their phone # is 866-916-9027). I did a quick web search for you and they have 1-bedrooms at $710 and 2-bedrooms at $800+. The other alternative is to keep looking daily on Craigslist.org and see if anything gets posted, or check out http://www.ReadingEagle.com
each day for the Classified rental housing ads online there.