Blood Bound Books is open for novel and novella submissions in the genres of Extreme Horror and Bizzarro or a combination of both. The word count is 30,000 to 80,000 words. The deadline is July 4, 2018 and payment is 50% royalty split, You'll find the details here.
On the same page you'll find that their "Best Of" Horror anthology is still open for submissions until May 31, 2018. Payment here is 5cents to 8cents a word.