You are able to login at some amount of Deepweb marketplaces with the only help of alternative URLs, that implies the following : upcoming customers and merchants can't sign up until they will obtain an links from an already registered shopper.
Search for those at https://darkwebonion.com/, it has fresh URLs to concerning Deep Web marketplaces. You shall follow these URL to get access to the sites.
Wherever there are some problems with an access,for example, links won’t work, you shall hang around and check for Darknet marketplaces link. Persist with it, as long as some of the markets close and launch registrations periodically, based on server load.