Buying Mushroom items or Mermaid set

[Sub Zippo]

Trying to complete my house theme, I have all but one room filled with a Fairy Tale theme.

I have most of the Mushroom set, but need the Forest Wall and the Mush Bed. I have duplicates to trade, but otherwise I'm happy to pay cash.

Failing that I would be willing to pay handsomely (I think?)for the Mermaid set. What's the going rate?