This weekend (until March 23), you can save huge on a number of games through PlayStation Network. This includes games for the PlayStation 4, PlayStation 3, Vita, PSP, and PSOne and PS2 classics. These also include a few Cross Buy titles.
PS4:
Dead Nation: Apocalypse Edition: $0.90
Surgeon Simulator: A&E Anniversary Edition: $0.91
Home - A Unique Horror Adventure: $0.95
Tennis in the Face: $0.96

PS3:
Bejeweled 3: $0.95
Noby Noby Boy: $0.95
Rock of Ages: $0.45
Zuma: $0.95
TOKYO JUNGLE: $0.90
Jurassic Park: The Game - Full Season: $0.80
Game of Thrones: $0.90
PAYDAY The Heist: $0.90
Dead Nation: $0.88
PAC-MAN Championship Edition DX+ Full Version: $0.90
"Sam & Max" The Devil's Playhouse: $0.80
Tales of Monkey Island Bundle: $0.80
Back to the Future: The Game - Full Series: $0.80
Poker Night 2: $0.96
Puzzle Agent: $0.90
Sam & Max: Beyond Time and Space - Full Season: $0.80
Eat Lead: The Return of Matt Hazard: $0.90
Matt Hazard: Blood Bath and Beyond: $0.90
Texas Cheat'em: $0.90
Heavy Fire: Shattered Spear: $0.90
Heavy Fire: Afghanistan: $0.90
R.I.P.D.: The Game: $0.90
Shoot Many Robots: $0.90
The Expendables 2 Videogame: $0.90
Mad Riders: $0.90
Babel Rising: $0.90
Flashback: $0.90
echochrome: $0.90
Galaga Legions DX: $0.90
NOBY NOBY BOY: $0.95
Cloudberry Kingdom: $0.90
Feeding Frenzy 2: Shipwreck Showdown: $0.95
Tales From Space: Mutant Blobs Attack: $0.96
Narco Terror: $0.96
Sacred Citadel: $0.90
Who Wants To Be A Millionaire: $0.90
Who Wants To Be A Movie Millionaire: $0.99
FERRARI THE RACE EXPERIENCE: $0.90
ibb & obb: $0.90
Mortal Kombat Arcade Kollection: $0.90

PS Vita/PSP:
Gravity Rush: $0.81 (VITA)
Tales From Space: Mutant Blobs Attack: $0.96 (VITA)
Star Wars: Battlefront II: $0.90 (PSP Only)
Kurulin Fusion: $0.95 (PSP Only)
Beta Bloc: $0.95
Dead Head Fred: $0.95
Despicable Me: The Game: $0.90
Super Pocket Tennis: $0.95
MYST: $0.84
T.A.C. Heroes: Big Red One: $0.84
STREETKIX: FREESTYLE: $0.84

PSOne:
Mega Man X4: $0.96
Mega Man X5: $0.96
Tekken 2: $0.96
Dino Crisis: $0.96
Dino Crisis 2: $0.96
BREATH OF FIRE IV: $0.96
Syphon Filter: $0.96
Syphon Filter 3: $0.96
Wild Arms: $0.96
Wild Arms 2: $0.96
Fighting Force: $0.96
Klonoa: Door to Phantomile: $0.96
SOVIET STRIKE: $0.96
Sim Theme Park: $0.96
Extreme Pinball: $0.96
Hi-Octane: The Track Fights Back: $0.96
Magic Carpet: $0.96
Nuclear Strike: $0.96
Populous: The Beginning: $0.96
Championship Bass: $0.96

PS2 Classics:
Katamari Damacy: $0.90
Twisted Metal: Black: $0.90

Cross Buy:
Dead Nation: $0.88 (PS3/Vita)
Home: A Unique Horror Adventure: $0.95 (PS4/Vita)
Tennis in the Face: $0.96 (PS3/PS4/Vita)