There is a parallel internet where illegal things and services are sold openly using Bitcoin crypto currency. If you decide to go down this path then anonymity should be your #1 priority. You should take a few days to educate yourself about Tor (the onion router), download and familiarize yourself with Tor browser or even better Tails live operating system. Google "deep web black market" there are youtube videos about it too. Some of the deep web sources might be outdated as some markets get shut down and new ones appear. There is also a search engine called "Grams" which allows the users to search through all of the black markets. You can find the .onion addresses on google or by using the privacy friendly search engine - .