There are multiple definitions - click on the translation that matches your context.

bargain means:

cena okazyjna, umowa, układ

rzeczownik

partial

bargain

noun

także: umowa preferencyjna (?)

a lower price than is usual or would be expected

People are flooding in to get the exceptional bargains on offer.

an agreement between two or more parties about what each party will do for the other

The agreement was essentially a bargain between the existing nuclear-armed powers and the non-nuclear countries.