Origin: ME chaffare, merchandise, trade < OE ceap, cep, a purchase + faru, a journey: see cheap & fare
See chaffer in American Heritage Dictionary 4
verb chaf·fered, chaf·fer·ing, chaf·fers verb, intransitive
Origin: Middle English chaffaren, to haggle
Origin: , from chaffare, cheapfare, bargaining
Origin: : chep, purchase; see cheap
Origin: + fare, journey, business (from Old English faru, from faran, to travel; see fare).