Lulu can be all over the place based on the number of pages, type of binding, type of paper, etc. Oh, and shipping can gouge you.

I've had some U.S. Letter hardbound books I've printed through them (photo-quality, color) that ran about $45 or so each.

You'd have to go to Lulu and work through all the steps in the post until you got to the last step to see the price.