Oz at Night can be purchased at these locations:

From Small Press Distribution:
https://www.spdbooks.org/Producte/9781935520450/oz-at-night.aspx
From Barnes & Noble:
https://www.barnesandnoble.com/s/oz-at-night?keyword=oz+at+night&store=book

From Amazon:

https://www.amazon.com/Oz-at-Night-Amanda-Bradley/dp/1935520458/ref=sr_1_9?s=books&ie=UTF8&qid=1318333774&sr=1-9