I planted about 2000 bare root loblollies in February of 2017. Paid a little over $200 for them. I bought a dibble bar and borrowed another one. Planted them with the help of a couple of teenage boys. It goes pretty fast. Here is the guy's info I bought them from:

Paul Jeffreys
Reforestation Advisor
ArborGen SuperTree Seedlings
1404 Sipsey Fork Rd.
Detroit, Al 35552
205-273-4367 (office)
205-712-9582 (cell)

I'm sure they sell Longleaf as well.