For sale here is a 10mL liquid culture of Pleurotus eryngii, the King Oyster mushroom. It is slightly slower than most Pl ostreatus or Pl pulmonarius and does well on substrate typically reserved for Lion's Mane. It prefers slightly colder temperatures and higher CO2 levels. In nature, it is found growing from the ground.
I've been working with this culture for awhile now and prefer it to others due to its sheer size.