From Longman Business Dictionary
half-priceˌhalf-ˈprice, half price noun [uncountableU] half the usual priceMany shoes are at half-price or less.
—half-price adjectiveadjOn Sundays from 3 p.m. to 5 p.m., admission is half-price.
—half-price adverbadvAnyone booking in advance can get their tickets half-price.