The good people at COPIM have officially announced the Open Book Collective:
The collective will bring together OA publishers, OA publishing service providers, libraries, and other research institutions to create a new, mutually supportive ecosystem for the thriving of OA book publishing. At the heart of the work of the Open Book Collective (OBC) will be a new platform. This platform will make it far quicker and easier for libraries and others to financially support different OA publishers and service providers via membership offerings.
The in-progress platform, when it's unveiled this summer, will be the best example of what I've called mission-aligned funding exchange—where funders provide direct support to OA publishers, bypassing the author-excluding APC/BPC. One especially exciting facet of the design is that the Collective will support publication bundles, including the ScholarLed publishers (of which mediastudies.press is a member).