A quick look at their pricing suggests 6 cents a page, but a $60 setup fee. For 10 books at 100 pages each, that is effectively 12 cents a page (averaging in the setup fee).
Self-publishers might want to consider Lulu.com, with low per-page costs, and apparently no setup fee.
Self-publishers might want to consider Lulu.com, with low per-page costs, and apparently no setup fee.