finding the cheapest bmw 420i convertible rental requires smart planning. book during off-peak seasons and compare multiple rental companies. look for weekly rates which often provide better value than daily pricing for the cheapest bmw 420i convertible rental. always verify what's included in the quoted price, particularly insurance and mileage limits, to avoid hidden costs. renting from suburban locations rather than airports can also significantly reduce your final cost, helping you enjoy this stylish and efficient convertible without exceeding your budget.