Dart Swinger I found today - should I buy it?

They just put the For Sale sign in it today and parked it outside. It has been stored indoors.

It''s kind of weird - I tried to buy it from the guy a few years ago, but as it turns out... I had killed his Jack Russell terrier with my FedEx Ground truck when making a delivery to his house a few months prior and he wouldn't sell it to me.

He passed away, now his wife needs cash. $4,000 firm.