Following on recent initiatives in which funders and libraries directly fund open access publishing, this study works out the economics of systematically applying this approach to three biomedical and biology publishing entities by determining the publishing costs for the funders that sponsored the research, while assigning the costs for unsponsored articles to the libraries.The study draws its data from the non-profit biomedical publishers eLife and PLOS, and the nonprofit journal aggregator BioOne, with this sample representing a mix of publishing revenue models, including funder sponsorship, article processing charges (APC), and subscription fees.