There are companies which sell shrooms online. http://www.climax.net is another example.
Most sell in countries where it is legal to sell dried mushrooms.
I tried to purchase mushrooms through climax.net. All I received was a VERY heavy letter from customs.
Customs let me off that time, but I think if I done it again I would be in deep shit.
Its very much at your own risk.
Jase.