Here's a list of the discounts on the PlayStation Store:

LIGHTNING: REQUIEM OF THE GODDESS (now: $2.49 original price: $4.99)
MOG’S OUTFITS: A WONDROUS WARDROBE (now: $1.49 original price: $2.99)
NOEL’S OUTFIT: BLACK MAGE (now: $1.49 original price: $X2.99)
NOEL’S OUTFIT: EZIO AUDITORE (now: $1.49 original price: $2.99)
NOEL’S OUTFIT: N7 ARMOR (now: $1.49 original price: $2.99)
NOEL’S OUTFIT: SPACETIME GUARDIAN (now: $1.49 original price: $2.99)
OPPONENT: GILGAMESH (now: $1.99 original price: $3.99)
OPPONENT: LIGHTNING & AMODAR (now: $1.49 original price: $2.99)
OPPONENT: NABAAT (now: $1.49 original price: $2.99)
OPPONENT: PUPU (now: $0.99 original price: $1.99)
OPPONENT: ULTROS & TYPHON (now: $1.99 original price: $3.99)
SAZH: HEADS OR TAILS? (now: $2.49 original price: $4.99)
SERAH’S OUTFIT: BEACHWEAR (now: $1.49 original price: $2.99)
SERAH’S OUTFIT: N7 ARMOR (now: $1.49 original price: $2.99)
SERAH’S OUTFIT: WHITE MAGE (now: $1.49 original price: $2.99)
SNOW: PERPETUAL BATTLEFIELD (now: $1.99 original price: $3.99)

PlayStation Store Update – PlayStation Blog