John Deere Tractors For Sale Is There Such A Thing As A Garden/yard Tractor "blue Book" On The Web?

Is there such a thing as a garden/yard tractor "blue book" on the web? - john deere tractors for sale

We have a vintage 1980 John Deere "116" farm tractor for sale immediately. I need some kind of reference value on the resale value, because I do not know to be the market price. Others who have found there need help using the site for garden tractors price?