A Guide to Print on Demand Publishers
CreateSpace 
Owned by Amazon, their fees start at zero dollars. They supply you with a free ISBN number and list your book on Amazon as a book and an eBook for no additional fee. You keep the rights to your book and set your own selling price.
Lulu
Also free. Higher per book cost than CreateSpace
iUniverse
Fees start at about $500 for a basic package. They have their own online "bookstore". You keep the rights to your book.
XLibris
Like iUniverse, fees start at about $500 for a basic package. They have their own online "bookstore". You keep the rights to your book.
Booksie
Free to publish your work online on their website.
Books On line
They charge nothing to offer your book for sale online as an e-book, but they keep the selling price and give you a royalty. Six month minimum agreement.
CafePress
No up front fees, but the per book cost is higher than CreateSpace.
Publish America
Claim to charge no author fees, but require a seven year contract.
48hrbooks
A book printer, they will print and ship your book but don't offer online selling options.