Kobo US currently has a "start a new series and save" promotion which has a number of good deals in its science fiction and fantasy section and I imagine also in some of its other categories.
(I posted more details for some of the sci fi and fantasy books in the FREE/BARGAIN — Science Fiction, Fantasy — 2017 if those interest you)
https://www.kobo.com/us/en/p/startanewseries2017
Deal is available until January 16