I contracted out the cover design. Very pleased with the results!
You can order a paperback copy of Nereis, Nereis directly from CreateSpace for a 25% discount using the code Y2YU3NHS at:
The paperback is also available on Amazon along with the e-book. Note that the discount code doesn’t work on the main Amazon site, only on the CreateSpace subsidiary (not helpful from my perspective — please send complaints to Jeff Bezos!)