The Readebook pop-up store (in front of Cibo) at Munno Para Shopping City, SA is having a 50% off sale of it's Marvel TPB graphic novels. I picked up Daredevil Vol. 3 for $9 originally $17.99 and George A. Romero's Empire Of The Dead: Act Two for $6 originally $11.99.
They've got others too like Avengers, Captain America, Hulk, Guardians Of The Galaxy, Ant-Man etc.