The Transformer Sale is a distributive negotiation about the sales price of a technical device, an electrical transformer. It is a one-shot negotiation where neither party is interested in their long-term relationship. The negotiation has a very simple structure and a broad Zone of Possible Agreement (ZOPA). The buyer has a very weak Best Alternative to a Negotiated Agreement (BATNA) and needs to reach an agreement. The role-play is well-suited to introducing negotiation classes and to explaining the ground structure of the negotiation concept, particularly with regard to distributive negotiations. It is also well-suited to motivating the significance of negotiation and negotiation education as agreements typically have a nice spread. Further, the case allows for a first discussion of the meaning of information, narratives and the creation of impressions and deception.