If you are looking for a physical copy, the disc is frequently traded on secondary marketplaces: Dream On Volume 11 - Sega Retro
You can find digital copies (ISOs or GDI files) of Dream On Volume 11 for use with emulators or specialized hardware on community preservation sites: Download Dreamon Volume 11
: Lists Volume 11 (v1.000) for direct download with community ratings. If you are looking for a physical copy,
: In the UK, it was bundled with Issue #10 of the Official Dreamcast Magazine . including Volume 11.
: Contains a vast directory of Dreamcast ROMs and ZIP files for regional variants. 🎮 Content Highlights
: Developer No Cliché included a special summer-themed mission specifically for this disc.
: Hosts a verified collection of Dreamcast sampler discs, including Volume 11.