TOブックス is having a 50% coinback thingy on bookwalker as well as some series having 99 円 volumes AND if you make a purchase of 3,300 yen or more (including tax), you will receive a special short story collection from popular series※.
99円
漫画:
新文芸:
文芸/小説:
You can also pick up some series for a special price:
漫画:
文芸:
Whoah, that’s really neat. 
I wonder what’s included, if any of the stories are new, etc.
odd… I thought I had included the small print… must have accidentally deleted it. 
It’s a collection of mostly stories that had been part of special releases on BW before.
※「TOブックス・人気ライトノベルSS集vol.7」の収録内容は、描き下ろしではなく過去に各作品の「ＴＯブックス・オンラインストア 限定特典」等として配布されていたショートストーリーを収録しております。22点のストーリーは、BOOK☆WALKERで実施するフェア特典としては今回初めてSS集に収録される内容となります。ほか20点のストーリーは、過去にBOOK☆WALKERで実施したフェア特典として配布済みの内容を再収録しております。
Affiliate links - of that lot a decent chunk of Korona Comics (and LNs) on sale including 本好き parts 1-4(?) 40% off and 50% coinback is a pretty good deal. I might pick up all four parts at this rate. (God I wish bookwalker/kindle ebooks were easier to convert to epub)
+1 - I hate having to behave like a pirate to read the content I’ve legitimately bought.
Not sure if this has already been mentioned, but I’ve found this Chrome extension very useful for checking when books in my wishlist get a decent points back deal:
I really dislike that points back aren’t visible on the wishlist normally. I wasn’t aware of this extension, so thanks!
Oddly enough the points are visible on mobile. I don’t understand why it’s not shown on desktop.
I didn’t realize it’s not shown on desktop because 99.9% of the time I mindlessly scroll my wishlist on mobile.
Mobile also has “price dropped” and “trending
now” lists (and trending now often has your saves that have a decent point back plus anything on temporary free to read).
The Gosick series is on major sale. First volume only 64 yen.
same over at bookwalker, if someone prefers:
2 volumes from one of the bl clubs previous reads 女装してめんどくさい事になってるネクラとヤンキーの両片想い are free for keeps right now
I don’t know if that’s happening anywhere else, but Booklive is having an event called 麗しのイケメン祭り which provides a discount coupon, but also make the first volume of a bunch of series free to read for the next two weeks. Like on Bookwalker, free stuff can be read without an account.
In terms of content, those manga are categorized as Josei, but more than a few look like they are only a few pixels/camera angles away from being TL.
Edit: Huh, the one I picked just looks like TL, no qualifier needed. And, like, I’m okay with that, I’m just confused at the generous Josei categorization.
The first seven volumes of メイドインアビス | L29 are ¥11 on Amazon:
https://www.amazon.co.jp/dp/B074CD8YT4?binding=kindle_edition&ref=dbs_dp_awt_sb_pc_tkin
Edit: odd, it’s not making the box…
There’s a 30% point back campaign on at Amazon right now. I’m supposed to be reading what I already have right now so I haven’t looked at what’s included, but maybe someone else will find something exciting 
It’s mostly garbage stuff that doesn’t interest me based solely on the covers and titles, but here’s one that involves a cat and is free!
I clicked for this, but I’ve already read it. @eefara ’s review is spot-on for anyone interested. 
Why thank you. 
Here’s the review for any curious:
Would recommend for fans of laid-back stories involving two of the best animals out there. 
It absolutely pains me to know that I just got the Shin Sekai Yori and Kara no Kyoukai collections for ~20% points back a few days ago and now I just checked and they’re 50% points back, which is an amazing deal 
If anyone’s interested, it seems to be a promotion on some collections! (you can search using “冊合本版”)
Shin Sekai Yori: https://www.amazon.co.jp/gp/product/B01N0M3H1L/
Kara no Kyoukai: https://www.amazon.co.jp/gp/product/B00RGM0BY0/
It’s 空の境界 Kara no Kyoukai btw, not 少女 shoujo… I’m a little tempted, but I think I’d probably stick with the manga if/when I get them in book form
Two funny things, when I read the preview: they used the kanji 頁 instead of ページ, and I had to scratch my head for a bit when I saw the word 百合, until I remembered that it does in fact mean lily, and not just GL 
