I heard back from Draft2Digital and they told me that I could make a free eBook. They said, "You can list your book for free, however, most storefronts do not accept pre-orders listed for free." They explained , "Can I list my book for free? Yes! Everywhere except Amazon. It will be submitted to Amazon for $0.99 (99-cents). They may price-match for free, to bring prices in line with other vendors."
They also said you can convert your eBook into a paperback. They said, "D2D Print is our print-on-demand (POD) service, which can generate a paperback version from your ebook, or from your own print-ready manuscript."
You can also get a free ISBN number. They explained, "We'll automatically assign an ISBN to any book published through our system free of charge."
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