Costs and cost coverage of complementary currencies has been neglected by researchers so far. This article provides an analysis of the different types of costs incurred and asks for appropriate means of financing such projects. External public and private sources are discussed in a critical manner. Self-financing appears to be a viable alternative; however, considering overall transaction costs, the burden to be carried by participants is considered to be a significant constraint with regard to this source. In the final part the question is discussed whether and how it can be possible to finance regional currencies that would have a significant economic impact. A scenario illustrates the potential of this feature with regard to the construction of new types of systems.