Smart meters in next generation power systems are used to gather power measurement data in a home with smart devices. To forward this data to utility companies, smart meters are equipped with wireless radios connected together and form a communication network, called smart grid communication network (SGCN). The aim of this paper is to provide a coexistence scheme between a SGCN of smart meters and neighboring communication networks (NCNs) for channel ordering. In this scheme, considering time-varying channel qualities and dynamic prices of channels, SGCN orders its own required channels from NCNs. Numerical results demonstrate the effectiveness of the proposed scheme from the viewpoint of SGCN operational cost.