Ivy Hill Farm on Rt 64 near Ringold used to have them. I haven't made apple sauce since the kids were little and I've noticed that they have cleared a lot of their trees in the last few years so I'm not sure they still do. I'd give them a call, I think they're in the book. You've got plenty of time though, I used to wait until October.
I bought a Victorio strainer at a yard sale 15 years ago. Have you ever heard of it? It's unbelievable for making apple sauce. Just wash them, quarter them, throw them in the hopper and crank. Skins and seeds come out on one side and sauce comes out the other.
Good luck.