If not limited to CDs only, as "selling or trading music related items" suggests, if you have any of the following items I will be willing to entertain the possibility of opening up negotiations.
Like Drone Razors Through Flesh Sphere D.R.O.N.E.R.E.X.I.A. CD (must include the DVD box sewn into the handmade shroud, the key, and the rusty razor blade)
Sale Freux Subterraneus cassette
Jakob Solace LP, original release on Graveface Records with the original album cover art on the LP gatefold cover, and the red and black vinyl
Permixtio - Demo II cassette, self-released
Rahu Caput Draconis cassette, self-released
Godspeed You! Black Emperor - All Lights Fucked On The Hairy Amp Drooling cassette, self-released
Godspeed You Black Emperor! F♯ A♯ Infinity LP, original release on Constellation Records (must be hand numbered in the appropriately colored ink and must have the ink transfer on the manilla envelope that holds the inserts to prove its authenticity)
múm Summer Make Good LP, released on FatCat records (and your maximum value placed on it must be 75 EUR)
Velvet Robe La Seance Haunted cassette, with the hand stamped velvet lined box, the two double sided inserts, the small candle, mouse/bat bones, two 1" pins. And the wax seal on the box must be unbroken.
Never whistle while you're pissing.