Honestly, I'd treasure that thing.
I would frame it, keep it safe, and let my grandkids figure out what to do with it long after I'm gone. That right there is worth more memories than money.
However, if you really do want to sell it, I'm sure there's a good price for it somewhere. I'd think someone here *could* price it for you, but I'd investigate E-Bay and see what he goes for there.
R.I.P. Ultimate Peter Parker
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