Found some more examples of blue mushrooms including one available to buy...
Pleurotus columbinus-Blue Oyster (This is the one you can buy)
Here are some other random blue mushroom pics...some may be identified, others I may not have found a name for...
Blue mushroom (Stropharia aeruginosa)
Entoloma sp. Balfour Track, Tarkine, Tasmania
lactarius indigo (edible, found in the US)
Sky blue mushroom. Entoloma Hochstetteri (virescens), Fox Glacier, New Zealand
....And 1 purple one just so you know they exist too
Cortinarius archeri, Wilson's Promontory, Victoria