The latest Sony sale is on for Playstation, called Days of Play. Lots of big discounts on a lot of games, dlc and upgrades.

One of the most useful discounts is 25% off all Playstation Plus subscriptions. So a year's sub for Premium is 75 instead of 100. That's worth it. Someone pointed out you can actually save even more by buying an 80 PS card on G2A.com for 75 to then buy Premium, leaving you with 5 credit.