Bargain

Attribute: Charisma
When trying to buy information or equipment, or get a higher price for his or her services, bargaining comes in handy for a character. Although bargaining should be roleplayed out between the referee and player, the referee should give in more easily to PCs with a higher Bargain skill, or let the player know critical information about the bargain. For example, he might tell the player that the NPC seems nervous, as if there's more to this job than meets the eye. Or the NPC seems anxious that you not see the left side of the car you're bargaining for.

Bargaining may be used to estimate resale value of items.