BuckTom
The comemmorative rifles are somewhat hard to pin down. They haven't been out all that long compared to older Winchesters and the numbers are quite limited. I think a lot has to do whether somebody loved Jown Wayne, Ducks Unlimited or whichever version they own. Hence the value is more personal than widespread. You might look at the link I included and get some idea as to what othe versions are trying to be sold for. Actual price
WILL vary. Also, note that in this list it is obvious that the very limited production runs are higher priced. And if your Grandpa was an Ontario Conservation Officer then you will pay more than the guy who grew up in Louisianna.
After all that, the rifle is probably in the $700 to $1500 range. Maybe! Mint and unfired is a definite plus. +$100
http://www.doublegun.com/roth.htm
Good luck
2bit