if you don't mind taking a long time, then its possible to sell anything. You need to have a certain amount of gold and/or items for it to work, and you need to go to one of the merchants that will give you full prices (ask if you want to be spoiled - not sure if you've discovered them yet).
What you then must do is adopt a bartering system, you need to find items in their list that are worth up to 60,000 (eg a couple of bits of decent armour or weapons...ebony, glass etc) - if necessary sell these smaller items to them first.
Then, say they have 10,000 gold, select items worth 50,000 to buy from them, and sell your thing for 60,000 and the transaction should work. Then sell the items you just bought back to them again (you'll have to rest for 24 hours to renew their gold.)
It works best with a high number of smaller value items because it gives you more flexibility in bartering. eg ebony darts are quite good (5 for 10,000 if i remember, but you can split them up.) Use the small items like these to assist in the bartering.
Sorry if that's not very clear. Because of the number of transactions required and the initial high level of gold the storekeep should have (or you'll be there all day) one of the two special merchants is extremely advisable.
Hope that helps
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