No seller of real or personal property, and no person engaged in the business of selling real or personal property, and no trustee, director, officer, agent or other employee of any such seller or such other person shall require, as a condition to the selling of such property, or for the performance of any other act in connection therewith, that the person to whom such property is to be sold, purchase or place any fire, property damage, theft, collision or personal injury insurance covering such property, from any particular insurance agent or agents, broker or brokers, or insurer or insurers.