We don't have a great many Cacti in our commercial stock although there are a few nice ones scattered around. This is one of the few I actually know the name of and there is a link with the core Greenkoos Brugmansia collection in that if you eat it you'll more than likely have a hallucinogenic experience. Naturally we don't encourage our customers to consume our plants but frankly you'd be much safer eating these than the Brugs as they're full of relatively harmless Mescaline compared to the mix of crazy stuff in the Trumpets that you're very unlikely to have a nice time with. Aldous Huxley liked it anyway.
Price is dependent on maturity of the plant. There's quite a range here.
Lophophora williamssii