Player vendors are able to sell stacks of items (with price set per item), are able to place items on display for sale, and are able to purchase items at a price defined by the player vendor.
I've gone ahead and updated the commands on the webpage, available here.
Information about receiving a player vendor is on the roleplay boards. We're starting with a limited release of 10, but will likely expand the number of available vendors (and market locations) as we go ahead. If/when new market areas open, existing vendor owners will have the option to relocate.
