Let me be clear. I am not offering this headset for sale here. I already have a potential buyer. So, I'm going to sell my David Clark's as I'm purchasing the Bose. They're a year and a half old, in excellent condition. I take very good care of them. They're the 13.4 model with an aftermarket ANR upgrade. As part of the deal, I would put on the new undercut gel seals. What do you think would be a fair price for this headset? A brand new H10-13X is showing for $550 plus shipping on marvgolden.com. There would be no shipping involved here.