If I remember correctly, it isn't in any "tab" of the market subset (I.e., it's not in the Buildings or Decoration "special" or "resource" tab). It was at the end of the "All" category of wherever it is. I don't remember if it's under Buildings, Decorations, or Nature. I tried to find it for you, but either I am maxed out at 2 or it is (temporarily, I hope) gone.