Mac, before computers there were these bulky things made out of trees with words on them. Some of those words were ads for boats 4 sale. ;)

Seriously, why not go down to the library and look at some classifed ads from October from your local newspaper and your local fishing weekly. You just might run into a v20/21 that was advertised, but didn't sell, so the seller said screw it - I'll wait till spring to advertise it again when more people will be looking to buy. You just might get the jump on a nice v20/21. 8)