There are allot of dark marketplaces online but there are also allot of fake marketplaces and i dont think you would pick the wrong one out if it so make sure you choose the right one
I think it is better not to use a dark market place. If you choose the wrong one, you will be scamed and lost money.
Its risky to deal in dark market almost scammers are staying there unlike here that we can use escrow to deal someone.
dark places is one of the home places of hackers and illegal scammers out there.. so better to stay away. .