What's It worth?

[claymole]

So I have an opportunity to purchase a number of original 8 x 10 glass plate negatives from a private individual. These negative came from the office of one of the steam shovel companies in Ohio. They are not broken and show expected wear for being 90 years old. What are they worth? What would you be willing to pay a piece? Feel free to post or PM me.
Thanks

[claymole]

I see there was a decent amount of interest in this thread, but no advice. I suppose that is understandable. So after some inner debate I have decided to post an image. These factory negatives are amazing, but require some help (and are receiving it). My greater concern is with were rest of these negatives might be. I fear they have already been lost to the ages, but then they might be in the hands of a private collector or in an archive collection. I know some still remain in Lorain, Ohio, but does any one out there know of any others? I would appreciate some direction as I try to bring scattered pieces back together.

Thanks
Claymole