Looks like Amazon are having another Marvel comic sale - may not be as good as earlier in the year but pretty close. You'll be able to read these on Comixology as well as Kindle. Note you will need the Kindle/Comixology app to read these so they are not DRM free.
Update Looks like the Amazon promotion of buying a graphic novel and receiving a free graphic novel is still active. More savings!
Old Man Logan ~$4.20AU
World War Hulk ~$2.44AU
X-Men Dark Phoenix Saga ~$4.86
Vision Vol. 1 ~$3.09AU
Darth Vader Vol. 1 ~$3.09AU
Check it out many savings to be had if you didn't already buy or missed out earlier in the year. Get cracking true believers!
Your best bang for your buck is with Epic Collections which collect 20 or so issues for about $US3-5.
Although if you're interested in the Black Panther movie coming up, I highly recommend the Black Panther Complete Collection by Christopher Priest. The entire 60 issues will cost about $US24. Many of the themes and characters come out of this run and it's damn good as well.