There are a few choices available for obtaining a low-cost transmission. One option is to purchase a used engine from a salvage yard or an individual. Another option is to find a transmission rebuilder that may save you money by repairing your existing transmission rather than replacing it. Finally, you might attempt negotiating a reduced price on a new transmission with your mechanic or dealership. Whatever choice you choose, make sure to conduct thorough research and obtain many quotes before making a final decision.