Although it's probably the most popular dessert apple in the UK (so much so that South African growers feed the spring/summer market), the Cox Orange Pippin is little known and little grown here.
I found them at the pick-your-own operation this weekend at Warwick Valley Winery, Distillery & Orchard in Orange County. They should be there for at least another week.
If anyone knows of other sources of Cox Orange Pippins in NJ (North, South or Central), please post it here!
In the meantime, if you're an apple lover and haven't tried Cox Orange, get thee to Warwick NY