New free distribution channels at CreateSpace
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I just happened to be on CreateSpace and noticed that two more channels are available to me (or anyone) for free. Free, I like that. So I switched them on for most of my titles. Today, a newsletter from CreateSpace confirms that they have opened up these channels for free. I use two of them, but since I use my own ISBNs, I'm not allowed the Library and Academic channel -- which would be ideal for my books. 

I don't have experience with Spark -- what do they offer?