I can't tell you what a good price would be for it now but I picked up my 401A in the cabinet maybe 12 years ago in central Indiana for a $100. As far as I was concerned I stole the darned thing!!!
The machine had been in a house that had a fire, machine and cabinet were undamaged but stank of smoke originally. Fortunately I was getting it from the best ever machine repair tech I've ever met. It came out of his cleaning/inspection shop running like a top and it's continued to run that way ever since including several years where I used it for earning my living!
It's a workhorse and IMO it's worth every penny of whatever you have to pay for it!!
And if it comes with a buttonhole attachment that fits the slant shank, I've got first dibs on it....
(you'll never need it for sewing hammock gear!)