Do you know year. condition, hours, 2wd, 4wd. with or without loader. Here's an ad for one I found on web: "1980 Yanmar 1300d 4wd YANMAR TRACTOR 15hp deisel 4wd State: TN
2000-11-27 Ad# 806
Asking: $2995.00 Hours:
15hp diesel..looks, runs, drives like new. only 582hrs..always garaged..3spd pto , 3 point hitch, well maintained...a strong hard working unit..will handle 4ft finish mower, 4ft yard box, or 50 tiller. can deliver within 300 mi of knoxville tn."
I also saw another one at $1400 but with many more hours.
The tiller could add about $400 to $600 hundred would be my guess. Less if it's a model you can't get parts for.
Just my thoughts
Andy