Well, I finally did. I finally got around to setting up a paperback version of Marti through Amazon, and it will be available soon. Prior to this, you could only order a print copy through Lulu.com. Just happy to expand my reach and give readers other options.
Keep checking on Amazon Author's Page for the paperback version: https://www.amazon.com/-/e/B004A9W5L4
And don't forget that Marti is available in ebook via several distributions channels: http://www.tonyasnowcook.com/#section3