How much does this cost to the nearest dollar?

Traxxas 5414 Center Differential Kit Revo
From the Manufacturer The optional center differential can be installed on Revo 2.5R* or 3.3 to help balance the distribution of power to reduce front end lift on acceleration and improve steering responsiveness. Requires forward-only conversion (included). *Requires short-rear output shaft, part #5416, for use with Revo 2.5R standard chassis. Designed to work in conjunction with the Revo rear brake kit (part 5417). Rear output shaft is long to accept rear brake kit. Standard length revo chassis will requires either modification or short output shaft (part 5416). Helps maintain stability and power Reduce front end lift Requires addition part for use with the Revo 2.5R

Price is $39.00
Price: $39