Dragon Wing is available to order in ebook, paperback, and hardcover. Many vendors carry it, but the most popular are Amazon, Barnes & Noble, and my publisher. Honestly, a google search of Rebecca K Busch - Dragon Wing will open several purchasing options for you.
Or, if you are looking for something a bit more personalized, you can reach out to me through this site and I can get a signed copy out to you for a special gift!
https://www.amazon.com/Dragon-Wing-Rebecca-K-Busch/dp/1787106829
https://www.barnesandnoble.com (then search the title Dragon Wing)
https://www.barnesandnoble.com/s/rebecca%20K%20busch
https://www.austinmacauley.com/author/busch-rebecca-k