I wonder what kind of mushrooms they are using and if they could be regrown from the package. It'd be neat to be able grow own thingies like that. Seeding trays are the first that came to my mind.
Try 100 things. 2 will work out, but you will never know in advance which 2. This tiny ad might be one:
Escape to gardens and natural buildings (for free-ish) in Montana