I am happy to arrange a 'fair value' trade for anything that I don't currently have. Take a look through my collection -- anything you don't see there is something that I need. If I explicitly have the issue marked as a 'need' in my collection, that's great, but I am happy to trade for anything that I don't have.
I am more than happy to go through your dupe list if you send it to me, along with an idea of things you might like to trade for from my dupes. Just send me an email: firstname.lastname@example.org