Standard buttom mushrooms in season cost as little as $2 Kilo.
Other types of Mushrooms like Porchini or Chestnut cost considerably more and could be $10 kilo or more. Rarer types of mushrooms that have to be scavanged from forests can be $50 a kilo.
I'm sure a good restauranter would be able to answer this question.
Shouldn't it be posted in food and drink?