Unfortunately, once a user passes into this realm, there is a minefield awaiting. The Wiki page starts with the benign and dives headlong into the frightening and disturbing. You can buy $10,000 of fake US dollars for the equivalent of $5,000 in Bitcoin, the currency of choice. The cryptocurrency Bitcoin is also generally considered anonymous. Other possibilities include, hiring a hacker, buying prescription drugs, and buying illegal drugs, and acquiring arms or if you so desired, get involved in unregulated medical trials. On the darker side, you can even hire a hit man.