Selling items, being able to find/buy mutliple items (For example, 2 pistols), dual wield?

[hhaslam11]

The player should be able to purchase, or find (Currently, finding weapons isn't implemented) more than one of each weapon. (Or body-armor type).
With that, player should also be able to sell items (including first-aid items) for half the price of what its worth.

With multiple weapons would also come with dual wielding, and maybe trading with NPC's? Could be part of quests too. "Find [NPC] a [WEAPON] and bring it back to him!"