This video by Clownfish TV lists printing companies that enable independent authors and comics artists to self publish their work. There are 2 major types of printing: traditional offset printing, in which many copies are printed in a run, then must be stored and shipped by distributors; and print on demand, a newer process in which a creator can send digital files to the company, then the company will print and ship copies individually as they are sold. Watch the video, then click the link to the original video page with links to all the providers listed.