You certainly will not be able to do a traditional summer externship, but you can still get hired as an "extern" at Jefferson, for example, during other times of the year. You just need to have had your Med-Surge Clinical, which you will do over the summer in FACT, and then can try to get in some where. CHOP offers a "sitter" position that offers no patient care but a potential way to get in there. Even that is no guarantee for a job, though.
My impression of the job market in the South Jersey/Philly area is tight. I was mostly applying in the area. I could have gotten a job in Wilkes-Barre, but I did not want to move there. If the situation became that dire, though, I would have moved though. I'd love to move to NYC, Cali, Miami, but again, those are considered by many to be desirable places to live and thus hard for new RNs to get jobs. Maybe when I get some experience I'll try that.
My advice is to network. I wouldn't say that's exactly how I got my job, though, but it seems to work for many people!