Here’s a handy little video on how to calculate your royalties per book sold and how much it will cost you to print and ship your own books. You don’t need to have an account set up with either CreateSpace or Ingram Spark to do this. It’s readily available directly on each site. Here are some links:
CreateSpace: https://www.createspace.com/Products/Book/
Ingram Spark: http://www.ingramspark.com/resources/tools
Update from when I did this: the quantity break for bulk printing on Ingram didn’t actually go away – it’s just higher than before. Better print costs start at 750 copies.