The University of Pittsburgh Press has made 500 out-of-print titles open access with a future fee-based print-on-demand option.
Here's an excerpt from the press release:
The University of Pittsburgh Press, in collaboration with the University of Pittsburgh Library System and the Chicago Digital Distribution Center (CDDC), is making nearly 500 out-of-print Press titles available again for scholars and students around the world.
Representing the full range of scholarly series and subject areas published by the Press, these titles are now part of the University of Pittsburgh Press Digital Editions collection, fully searchable and freely accessible to anyone with an internet connection through the University of Pittsburgh Library System's D-Scribe Digital Publishing Program. Over the next year, they will also be made available for purchase in reasonably priced paperback editions through the CDDC. Readers and researchers may read and search the full texts online, and those who wish to have a print copy may purchase it through retail outlets or directly from the Press.