Udder Milk Co-Op
Udder Milk can feel a little black-market-ish, but considering the sale of raw milk in NJ is illegal, they have to be. Their delivery trucks are non-descript white vans that look like they've seen better days and their delivery guys don't wear uniforms from what I could tell. They are cash-only.
When I used them, I followed the instructions on their website and simply left a cooler with ice or a cold pack on the porch by my front door. Inside the cooler I taped a Ziploc bag in which had a note reading "Udder Milk" with exact cash for that week's delivery (the bag was to keep the money dry if it fell into the melting ice). I'd have the cooler out even if I did plan to be home all day so I didn't have the risk the delivery man waking my sleeping toddler. This system worked smoothly for me and my deliveries were always cold and tasty.
That said, they do have communication issues. I was suppose to receive credit for a cracked egg that was clearly the fault of the way the delivery man layered items into the cooler, but never did. I was able to use the egg, so I didn't make a huge issue out of it. But it's something to be aware of.
I stopped using them because we simply don't consume enough dairy to use 1/2 gallon milk + cream before it turns in a week.