We've created this Forum Thread with some workarounds and advice to assist you in publishing you ebook.
Quoted vs. actual manufacturing cost for print books
Maybe I'm missing something here, but it seems like the predicted manufacturing cost of print books (http://www.lulu.com/create/books) differs substantially from what you are charged.
For example, my 2012 book, http://www.lulu.com/us/en/shop/tristan-eifler/the-lycanthrope-club-book-i-full-color-edition/paperback/product-20534405.html , costs 23.41 USD to print. It is an 86 page, full-color, 8.5 x 11" perfect-bound paperback; it is available for retail distribution. If you plug those numbers into the 'create' page the manufacturing cost is listed as only 17.56 USD per book for premium paperback. Have the print costs changed or do the quoted manufacturing costs vary from the final cost for some reason? If it's the former, I'm being overcharged on the print costs for my older books!