I don't know that there is one. If you have something for sale, or are looking to buy, I'd say go on craigs list and look at similar models to see what people are asking for it. Another option for example is to check out local dealers websites and click on their used equipment inventory. I'm on John Deere dealer sites all the time.
I was wonderin cuz I had went to a place to sell some equiptment and they said the blue book value on it was blah blah blah. I had never heard of a blue book for lawn equiptment so I decided to ask u fine people here on FA
They were blowin smoke up your ass. It's worth what you can get for it and the best way to find out is to see what others are getting for the same thing.
I understand and thx for ur answer :-)