lulu.com is a great place to cheaply print books and it only takes about a week. I am not a lawyer and have no idea about its legal applicability, but one just uploads a PDF.
I thought the paper felt a bit cheap and looked somewhat greyish. Although it might depend on the options you select.
But as far as the price goes, they're not expensive but for instance a 126 page book published there was $15.23 (ex. shipping) and you might want to check if the regularly available paperback is not cheaper than that.
It's absolutely great if you made something (wrote a book, or I dunno put your favourite sourcecode to PDF, whatever) with a load of pages and want to own it as a real paperback. There's something extra cool about turning something into an actual physical book :)