I've seen a couple of folks mention this sale in various genre threads, but thought it was probably worth a general post, for folks who don't follow specific genres.
For those who don't know (probably no one, but WTH), Smashwords has a few sales each year, where various titles will be marked down anywhere from 25% to 100% with different coupons.
link:
https://www.smashwords.com/shelves/promos/1/any/any
Smashwords has a pretty unusual selection of authors, many of whom are self-pub, but some of whom are authors who are self-re-pubbing previous conventionally published works.
It can be really hard to find things on the Smashwords site, so one trick you can use is to search this Deals forum for
threads with Smashwords in the title, from past sales, and then check out the posts in the threads themselves for authors/titles that you might be interested in. Many of the same titles/authors go on sale in every sale, so if it was on sale in the past, it has a pretty good chance of being on sale again.
Anyway, enjoy...