The 'value' on that thing is only 50ish bucks. Just because you had to spend a lot to get it, doesn't make it worth that. Not many people are wanting that item to drive the cost up that high.Good luck on the trade though.
Have you tried this guy yet?http://aethercards.com/discourse/index.php?topic=2746He's looking for a Porper clip. Maybe you two can come to an agreement?