I was the one that submitted these to the site. There was some LDon armor that was put into live several months ago, and then a week or so later they were pulled out (they went live by mistake). For whatever reason, they decided to leave the ones that were purchased (thankfully!).
The equipment was available from every Adventure Merchant, for a price of 1492. I only wish I would of had more points saved up, as all of the "Dark Hide" items were very nice for monks, better than the Guk armor.