An S400 P went for $3,300 in 2015 (date on the Centauro badge in CL listing) so $2,300 - $2,000 is still high but a little more realistic.
The seller does indicate in the ad that they're moving and cannot take the machine with them, maybe the OP would have a better chance to negotiate as their moving date approaches? Certainly worth emailing them an offer, all they can do is say no.
Code:https://phoenix.craigslist.org/nph/tls/d/phoenix-minimax-bandsaw/7330163653.html