You are able to enter at several Deepweb markets using only the URLs, it means a tricky situation : upcoming clients and vendors don’t have a possibility join the market until they will receive an alternative links from an already enlisted shopper.
You can find those at http://deeponionmarkets.com/, it has fresh alternative URL to all of the Darknet marketplaces. You shall follow these links to register on the sites.
If there are some troubles with an access,for example, links won’t work, you may wait and check for Deep Web marketplaces URL. Persist with it, as long as some of the markets may stop and let registrations periodically, based on server load.