Back to the Future Full Game
Blast Factor
Braid
Crash Bandicoot 1-3 (PS1) (Not compatible on Vita) (SCEA finally changed the price of Crash 3 to 99 cents. Better go get it if you want it)
Crash Commando
CTR: Crash Team Racing (PS1) (Not compatible on Vita)
Echochrome 2
Everyday shooter (PS3) (PSP/Vita)
Gex: Enter the Gecko (PS1)
Gotham City Imposters
Jurassic Park The Game Full Season
Plants Vs Zombies
Red Faction (PS2)
Red Faction 2 (PS2)
Red Faction Battleground
Retro City Rampage (PS3/Vita Cross-Buy)
Retro/Grade
Sam and Max the Devils Playhouse
Spyro 1-3 (PS1) (Not compatible on Vita)
Stuntman Ignition (PS2)
Super Stardust HD
Tales of Monkey Island Bundle
Tokyo Jungle
Urban Trial Freestyle (PS3) (Vita)
When Vikings Attack! (PS3/Vita Cross-Buy)
World Gone Sour
Not up on Webstore or Vita yet but can be purchased through the PS3 Store
Edit: Sale ends on Monday, April 21 at 7:00 a.m. Pacific
Sales are not PS+ exclusive. If you don't have PS+ you can still hop on these deals
Get Tokyo Jungle
Edit 2: Blog post up http://blog.us.playstation.com/2014/04/18/ps-store-flash-sale-30-games-available-for-0-99-each/
Titles available on webstore Via search or clicking on one of the links in the blog post
Edit 3: Webstore link https://store.sonyentertainmentnetwork.com/#!/en-us/flash-sale/cid=STORE-MSF77008-9_FLASHSALE2014