While a bunch of fighting games are seeing discounts on Steam, Arc System Works has provided a few sales of its own for the BlazBlue and Guilty Gear series on the PSN. Each version of BlazBlue: Chronophantasma EXTEND is now $12 (PS3, Vita), and Guilty Gear Xrd Sign and Extend are now $15 on PS4.
EXTEND is normally $40 on both Vita and PS3, and the PS4 version if EXTEND as well as Sign are typically $50, so this is a pretty deep discount. Keep in mind though that BlazBlue: Central Fiction exists, as well as Guilty Gear Xrd Revelator — so you may want to just wait for the updated versions instead.
BlazBlue, Guilty Gear [iPlayWinner]