The guy won't budge on the price. If $3500 is not a deal, is it a fair price?
It's not a deal, but not a ripoff. I'd say it's a bit high, but I'm not familiar with that exact model. I listed a bunch of stuff in my first reply - does it check most of those boxes?
That's all pretty important stuff to me, and would push up the value.
For example, by dad bought a mill and it's impossible to tram. The head will tilt side to side, but won't "nod" front to back. It's slightly out from the factory, and that's just the way it is (it could be shimmed I assume). It has belts that are a pain to change, so it's frequently at the wrong speed, and there's only 5 possibilities with no back gear (low range). There's no power feed on the quill, so using a boring head is more difficult, and you need to raise the knee to use. it.
You said it includes
6" kurt, some collets, drill chuck, boring head and a package assortment of clamping accessories. Auto feed for x from the manufacturer and an older, but working, DRO.
That's not much to get started with. Hopefully "some collets" is at least 1/4, 3/8, 1/2 & 3/4 from a quality name brand. Is the drill chuck a good one, and mounted on an R8 spindle (or at least 1/2" straight shank)?
All that said, if you want a good quality mill and have the cash, this would be a good one.