barˈgain-hunter noun

A person who goes shopping for bargains

bargaining chip (US) or counter (Brit) noun

An advantage or asset possessed by one party which can be used to extract a concession in negotiations

bargain and sale

In law, a mode of conveyance whereby property may be assigned or transferred for valuable consideration

bargain for

To count on, make allowance for, expect

bargain on

To rely on, expect

drive a hard bargain

To bargain vigorously and uncompromisingly before coming to an agreement

into the bargain

As well, in addition

make the best of a bad bargain

To do one's best in an adverse situation

sell someone a bargain (Shakespeare)

To make a fool of someone

strike a bargain

To agree on terms