Rutgers spring plant sale is coming up. May 7,8,9 I think. You can google it. I dont think there was organic, but the selection was tremendous last year. Get there early tho on Fri if you can they do sell out of things. Also, bring a wagon/cart of somekind to carry them back to the car, which is a little walk. they also sell flowers & trees. The help is very knowledgeable.
Also, there is Gasko's family farm which is one of my favorite places to shop.
Their prices cant be beat & have tons of great plants/flowers/mulch/dirt/etc... They are in Englishtown & well worth the trip if you need flowers as well as veggies. I drive 40min to get there from Northern Middlesex Co.