Seems like I saw one at the Neverdie Pawn Shop a few weeks/months ago for +200 but I couldn't swear to that price. A few Korss H350 unl have sold for anywhere from +35 to +300 in that same amount of time and a week or two ago I saw one in a shop for +500, which I think is a tad overpriced, but it would lend credence to a current market value of about +100 to +200ish for the S50 imo.