I live near where you do, and I've always had problems finding Java Moss too, heh. What I normally end up doing isn't as effective, but still does work.
If you have some aquatic plants that have a heavily developed root system, you can... unearth them, a bit. Just pull them up a tiny bit, an inch at most. Most of the larger plants that I have have CRAZY roots that tangle every which way, and for my baby fish, it always seems like enough.
Any plant that is on the bushier side can help a great deal. There's a lot of plants that have those fanned out, fine leaves... they drive me crazy cause they shed a lot, but they can be immensely helpful as well. Plant a whole corner of your tank, or let some float up at the top if they don't need to be planted - this gives the fry a lot more room and options when running from the larger fish.
Central Jersey, perhaps? If you do in fact get them to stock something like Java Moss... Tell me when & where, please!