If you own a PlayStation 3 or PlayStation Vita, you should go check out the PlayStation Store right now. From now until (probably) Sunday, there is a $0.99 flash sale going on for a number of titles.
Back to the Future Full Game
Blast Factor
Braid
Crash Bandicoot 1-3 (PS1)
Crash Commando
CTR: Crash Team Racing (PS1)
Echochrome
Everyday shooter (PS3) (PSP/Vita)
Gex: Enter the Gecko (PS1)
Gotham City Imposters
Jurassic Park The Game Full Season
Plants Vs Zombies
Red Faction (PS1)
Red Faction 2 (PS1)
Red Faction Battleground
Retro City Rampage (PS3/Vita Cross-Buy)
Retro/Grade
Sam and Max the Devils Playhouse
Spyro 1-3
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

There are some great games there, so be sure to act fast.