A player can sell a tradable item out of their bazaar by setting the price. An icon of a little brown sack will show up next to a persons name when their bazaar is available. The new retainer system will allow players to have an NPC act as a personal bazaar, even when logged out.
To add an item to your character's bazaar, select the item in your inventory list, then select Sell Item on the item's detail screen. To add an item to your retainer's bazaar, you must first summon your retainer and then choose the appropriate option from their management menu.
Items can be priced singly or in groups; set the number of items in the group, then choose Set Price or Unit Price. In Set Price mode, putting a value in either the "Price per unit" field or the total field will update the other. In Unit Price mode, only the "Price per unit" field can be altered.
To list multiple items in a single stack without requiring purchase of the entire stack, use the quantity field to set the total number of items you wish to offer for sale, and choose the "Unit Price" option. Using "Set Price" will actually prevent those items from being sold as anything but a set.