Now it is operated by the guild "Chichis' Mushroom Exchange" : DarthBobo, Kaelo, and Levi.
You can arrange a trade by visiting http://neologic.net/atitd/mushroom/ . /chat one of the operators so they can waypoint in and complete the trade.
The mint is still located at -1566,5768 (can't move that) but the stock is conveniently located east of the LB mega at 1362,4185 in front of the guild hall which is located just south of scenic Blighted Lake.