freebie

or free·bee

[ free-bee ]
/ ˈfri bi /

noun Informal.

something given without charge or cost, as a ticket to a performance or sports event or a free sample at a store: Freebies can be very useful in promoting your brand or business.

Origin of freebie

1925–30, Americanism; free + -bie, of uncertain origin; perhaps originally a noun phrase free bee, with bee2 as in put the bee on to borrow money with no intention of repaying it

British Dictionary definitions for freebees

freebie
/ (ˈfriːbɪ) slang /

noun

something provided without charge

adjective

without charge; free