Every item that a character in the sim has has to be acquired somehow through RP. A character who is a "dealer" has an external supply of items, whether it's guns, cyberware, or some other commodity. This might mean that they have smuggling contacts who bring the merchandise to them or could even be a legitimate contract with a corporation not represented in the sim. It's up to the player to make up a story behind who they are getting their merchandise from. Dealers are allowed to receive a shipment of good in once per week, they need to make up a list of what their bringing in and give it to an admin, who will then deduct the nuyen from their account. They buy items at 90% of the cost listed on the wiki (to represent the expenses involved in acquiring the equipment) and can sell them to other characters for whatever the characters are willing to pay.