RPGNow vs. Lulu

I have a question, especially for non North American, overseas folks.  Both RPGNow and Lulu do the print on demand.  Which one do you prefer and which is cheaper?  Quality wise I have gotten books from both and they are comparable, good quality.  Price wise, I think RPGNow wins by a small margin.  But don't know which is cheaper for Australia, Europe, Asia, South America, Africa and even the penguins in Antarctica.  How much do charge to ship?

If you have a moment please let me know.  This is one area (I have several but let's not dwell) I am completely ignorant.  Thanks.