Anyone know rough value of auto'd GU shoes - Barkley, Nique+

[burke23]

So I have game used shoes of a few star players (and a few scrubs) that I am curious about the value of. All shoes are autographed as well. The stars I have are Charles Barkley, Scottie Pippen, and Dominique Wilkins. The Barkley shoes are the very first shoes he was given as a Phoenix Sun.

Not sure I would ever sell - but how would I estimate the value? How about for a semi-star (Danny Manning) or scrubs?
Thanks for all insight.
Pete