You can pre-order Key of Arcandus through any major online book retailer such as Barnes & Noble or Amazon. Or support your local brick-and-mortar bookstore by requesting a copy through their distribution channels. I’ve published through Ingramspark, so every retailer should have the ability to order copies through their networks. They just need someone to request it of them.
I will be doing multiple events and giveaways (mostly online) to help get more copies out there into the world. Stay tuned to my website or Instagram to be notified when such events become available!