Story's up in Freehold has an excellent selection at reasonable prices. Find yourself on route 32 and go north to Freehold and then turn left. Worth a trip.
I stopped at the Matterhorn nursery yesterday during my lunch hour. Very large selection of everything. They did have a few different varieties of peonies, but I forgot to bring my suitcase full of cash. $50 for a three gallon peony is too much for me.
Looking for cheep plants, keep an eye out in the paper for private plant sales, you can find a lot of good things as a lot of the plants are rarities that the people have ordered. Ex. two gallon peony $5.00