the.com/haggler

means A person who negotiates persistently to get a lower price, usually through back-and-forth bargaining.

from From 'haggle,' which likely comes from a Scandinavian source related to Old Norse 'haggva' (to hew or chop) — the same root that gives English 'hack.' The idea seems to be cutting a deal down piece by piece, the way you'd hack at something to whittle it smaller. By the 1500s 'haggle' meant to cut clumsily; by the 1600s it had settled into its modern sense of wrangling over a price, with 'haggler' following soon after as the person doing the wrangling.