No, I had not considered CreateSpace. I have had very good results with lulu publishing these books:
http://www.lulu.com/spotlight/cocaseattle on lulu, and I am very familiar with their process. CreateSpace looks like it MIGHT be a big cheaper. I am not sure that either the Amazon option (also available through lulu) or the Kindle conversion (you have to pay) are really much better on CreateSpace, it's hard to tell because their website is a tangled mess.
I think if you could work the margins, i.e. base price for a 24-108 page book is 3.66, while base price for a 110-828 page book is 1.50 a book (wonder how many 108 page books they publish), you might be able to save more money. But they call these "fixed charges" rather than prices, so I am still not sure I am reading it right. I will keep looking at it until it starts to make sense.