Kobo US is having a 60% off on cozy mysteries sale today only, with coupon code BFTUESDAY, as part of their run-up to Black Friday.
The splash page is here:
https://www.kobo.com/us/en/p/blackfriday2019usa
There are several categories listed, including "No case is too tough for these ladies to crack", "Cozy up with a blanket and a book", "Only ace investigators can solve these bonkers mysteries", and "Crime will never be ancient history". I haven't had a chance to dig through these in detail, but at first glance, it looks like there's a heavy proportion of Open Road titles, and 60% off the standard prices for Open Road titles is still more than the $1.99 or $2.99 that most of them go on sale for fairly often. So evaluate carefully before you buy!
Still, if you have a title you're looking for that rarely goes on sale (but is couponable at Kobo), you might take a look...
ADD: I tested the coupon on a couple of non-listed titles by authors who also have some titles on the lists and it didn't work, so from my sample set of 2, it appears the coupon really is limited to the listed titles. Your mileage could still vary, though.
Also, the coupon does work on some titles on the list that are already on sale, or inexpensively priced. For example,
Postmark Murder by Mignon G. Eberhart is on sale for $1.99 (or $1.79 VIP) and the coupon takes an additional 60% off that.
So what I did was sort each of the four lists for the four categories by price, and check out the inexpensive ones near the beginning to see if I wanted anything, and I found just a couple of titles of interest...