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My only JB signed comic is one I got from eBay as he doesn't do cons anymore.
It was reasonably priced, to be fair.
Everything else I've got signed was face to face with creators at cons.

I'm not a big fan of grading comics, personally, so I don't think I could bring myself to pay anywhere near that for a slabbed comic or a variant.

I've paid close to that for original art but I...