Note that if you have a book with an ISBN, it seems that the non-discounted price on Lulu is the one used by other sites such as Amazon. If you mark up your book at Lulu simply to offer a discount, be aware of that.
I noticed that. They raised my book price to $13.95 instead of the lower discounted price. I was discounted on Amazon for a long time until recently. But they did lower the kindle price by 50 cents instead of keeping it where I had it.