1 day only sale on Batman graphic novels and collections at comiXology. 10 books at US$2.99 each, saving up to 80%.
I recommend The Killing Joke and Dark Knight Returns. I also understand The Long Halloween is a good one.
This sale will likely end about 1pm Thursday 24/07.
Lots of other good sales right now also, check them out here:
https://www.comixology.com/comics-sale day
specifically the Image sale here:
https://www.comixology.com/comics-sale?list_id=3003
I recommend Rat Queens, Saga and Sex Criminals