Many of the low-cost extremely mass market kinds of books that you find at somewhere like Dollar General or Dollar Tree were created by packagers who produce a product *for* a company -- thus allowing the company to have books with their company name on them, without the costs involved in what you might think of as "normal" publishing. The books are produced at a flat fee (very very low) with no royalties and the company owns all the rights. They don't get listed in places like the CWIM or places like Preditors and Editors because they aren't "publishers" in a context that matters to writers like us because they don't take submissions.
If you have written and sold a lot of magazine stories and you'd like another source of money that (1) have very tight, very rigid deadlines, (2) sometimes no byline, (3) no royalities and low flat fee payouts...you can send resumes and clips to children's book packagers to be considered for these kinds of jobs. I don't think the CWIM really lists packagers anymore (they once did). I do believe that SCBWI still has a list of packagers that is available for members.
gran
PS...packagers do other things than those little books and some of their clients include big publishers since many book series are actually handled by packagers -- but ONE of the things that is usually done by packagers is the production of those cheap mass-mass-market books.
