At my local grocery stores, the price of oyster mushrooms is usually between $6.99 and $7.99/pound. Sometimes they are sold loose by the pound and sometimes they are packaged. However, how much oyster mushrooms cost depends on where you buy them. I've seen them cost slightly less than $6.99/lb and I've seen them sold for quite a bit more. Generally, they are more expensive than button or cremini mushrooms, but typically less expensive than morels, chanterelles or other speciality mushrooms.