PlayStation's Spring Fever sale continues on with up to 50% off a ton of titles that are available through the PlayStation Network. This week's sale is related to PlayStation All-Stars Battle Royale, as the game itself plus the franchises the guest characters appear from are all discounted. All-Stars is on sale for $27.99 on the PlayStation 3, and $24.99 on the Vita. Plus members will save a little more with the PS3 version running for $19.59, and the Vita version going for $17.49.
Several other franchises are on sale as part of this, including every Metal Gear Solid available on the PlayStation Network. Seriously, that's everything with the exception of Metal Gear Solid 4 since there's no downloadable version of that game.
What else? The first two BioShocks, all of Sly Cooper, all of LittleBigPlanet, Devil May Cry HD Collection, all of God of War (except the third one), all of inFAMOUS, a few Twisted Metal titles, and all of Ratchet & Clank.
PlayStation Blog has the full breakdown of all the discounted prices for each game, plus what games are completely free to PS Plus members.