Looks like Twelfth Planet Press is open for novella submissions. Details are here (scroll down a little to see the general call, the holiday one just closed). They opened today and will be open until the end of November so you have a few months to get something finished if you need to.
[NOTE: I don't know a lot about this publisher but they have some decent award wins/nominations, they are offering a small advance and what appear to be decent royalties for eBook publication. However, do your own research. ]
[NOTE: I don't know a lot about this publisher but they have some decent award wins/nominations, they are offering a small advance and what appear to be decent royalties for eBook publication. However, do your own research. ]