Sorry for being late to the game.
Firstly the biggest piece of *that* particular Bridgeport mill is about 1000lbs. reinforced stairway is a must, and that costs $$$.
There is no positive negotiation with the seller possible. On this one I'd give them a business card with 600$ for the mill and 1000$ for the lathe, and walk away.
The mill is about 4 hours to disassemble - with a crane - and the lathe will need about 6-7 hours, again with a crane.
With a winch, and if the pull is straight, it will take about 8 hours to get all the heavy pieces out.
In a garage, for sale, that particular mill is good for 1800-2000$ MAX, and the lathe about 2200$., Actual out-of-pocket costs to move them both would be around 1000$, and the value of that move is over 4000$, so the prices I'd offer would be a gift, not a business proposal.
I have looked at 4 round ram mills in my time, and they do not age well. It is not worth the sweat equity to disassemble it and reassemble it.
The lathe shows promise, but there is easily 2000$ of sweat equity disassembling the lathe, reassembling and realigning the headstock.
I was quoted $10k to move the lathe out of Bert's basement. I got 3 estimates to move the mill out - all were "no bid" as it was too much risk. (!!)