adjective

giving good value or return in relation to the money, time, or effort expended.

a small, economical car

cheap,inexpensive,low-cost,low-price,low-budget,budget,economy,reasonable,reasonably priced,cut-price,cut-rate,discount,discounted,bargain,bargain-basement,cost-effective,effective,efficient,energy-efficient,fuel-efficient,energy-saving,fuel-saving