Synonyms for Giveaway:

n.

economy, economic, competitive, affordable, favorable, inexpensive, low-end, cheap, economical. evidence, proof, mark, demonstration, smoking gun, the color of someone's money, sign, illustration, suggestion, pointer. red packet, settlement, surprise, gift, benefaction, care package, valentine. freebie (noun)
gift.
gift (noun)
benefaction.
giveaway (noun)
game show.
sign (noun)
proof, suggestion, mark.
signification (noun)
evidence.

Other synonyms:

Other relevant words:
cheap, mark, sign, gift, inexpensive, economical.