Killzone: Shadow Fall and Knack are both down to $42, while Injustice: Gods Among Us Ultimate Edition is $35 and Contrast is down to $7.50 on both PS4 and PS3. And speaking of PS3, you can grab Assassin's Creed 4: Black Flag, Gran Turismo 6 and Madden NFL 25 for $42 each. The PS Vita version of FIFA 13 is down to $14. Unfortunately, PS Plus subscribers won't find an added discount on top of these sale prices.
The full list of what's on sale can be seen over on the PlayStation Blog. We'd suggest checking out the PS Blog's list before booting up your console as there isn't a dedicated hub for this sale in the PlayStation Store, so you'll need to track down each game individually.