1.
bonus, perk, special benefit
A special benefit, bonus item, or privilege given to customers, members, or participants. Commonly used in marketing for promotional extras included with purchases or memberships.
Usage
Very common in consumer and marketing contexts. Used for promotional extras (DVDs with bonus content, pre-order gifts), membership benefits, and credit card rewards. Not to be confused with the homophone 得点 (score, points in a game).