You are required to login at several Deepweb marketplaces with the only help of alternative links, what implies a tricky situation : new buyers and vendors can't register before they will receive an alternative URL from an already enrolled shopper.
Look at https://darkwebonion.com/, it has updated link to concerning Dark Web markets. You ought to go to these URLs in order to get access to the sites.
In case that there are some troubles with an access (links don't work), you may lie in wait and check for Deepweb marketplaces alternative URL. Keep trying, as a several amount of the markets may stop and launch registrations frequently, based on server load.