SDCC is this weekend and some random Marvel and DC graphic novels are on sale. These aren't the "best ever" prices, but they're not bad. There's too many to list, but here's some of the DC ones I had been watching:
Batman: Knightfall, Vol 1
Injustice: Gods Among Us: Year 5, Vol 1
Injustice: Gods Among Us: Year 4, Vol 2
Injustice: Gods Among Us: Year 4, Vol 1
Inustice: Gods Among Us: Year 3, Vol 1
Black Lightning, Vol 1
Black Lightning, Vol 2
New Teen Titans, Vol 8
Green Lantern: Hal Jordan, Vol 1: Emerald Dawn