NewMyths have opened up their summer submission period - From now until July 31st, send "your science fiction and fantasy—dark or light, serious or humorous, hard or soft science fiction.... [they] publish fiction, poetry, and non-fiction works, as long as they are 10,000 words or less, previously unpublished, and preferably PG."
https://sites.google.com/newmyths.com/newmyths-com-home/submissions?authuser=0