This website is fairly simple to use. By using the word “drugs” we managed to find around 100 pages worth of results with most links being live and updated. At the top there is an Advertising section and all of the websites in that category are paid for therefore should not be 100% trusted. You can add an URL yourself for only v3 .onion domains.
Advertising on this website is also allowed and the cost for a month is from 150 USD to 700 USD.