Costs and cost-related factors connected with providing on-line search services through the public library are examined. The examination was based on preliminary results from an on-going evaluation of an experimental program (DIALIB). In the DIALIB experiment Lockheed's DIALOG search service was available to the public through four public libraries in the San Francisco Bay Area. Preliminary data were gathered on fixed costs connected with system operation, on individual search costs, and on costs associated with the additional time demands made on the library reference staff. In addition, several factors were identified which impinge on the provision of financial support for such on-line search services. (Author/JY)