For a small series to see how it goes you could perhaps just print on Ilford Portfolio weight paper ? You can add your name or logo using lith film to make a second exposure, if you're careful with alignment etc. or set up your artwork at a large size, re-photograph it and print from that. There is even back-printed postcard paper available. Lots of options without needing a print-works. The question remains over financial viability though....

EDIT: I should just say I'm talking about normal wet-darkroom printing here of course.