Comixology has a bundle sale on some Dynamite books until 9/27/15. Some great deals in there, but be careful, as you may own the books at Dark Horse or Groupees or Humble Bundle or etc etc etc
https://www.comixology.com/Dynamite-...Sale/page/8262
From Marvel, a today only sale on What If ?; $.99 singles on a few different iterations of the series.
https://www.comixology.com/What-If-Sale/page/8269
The weekend Dark Horse collection sale at Comixology is on Avatar: The Last Airbender.
https://www.comixology.com/Avatar-Th...Sale/page/8280
That will likely be the weekend sale at Dark Horse proper as well, but we'll see in a few hours.
https://digital.darkhorse.com