i need to replace the rear transmission seal, need to know estimated repair cost on 2001 Nissan Sentra

i took my car in for an oil change asked them to check under the car for any leaks. i was told the transmission had a small leak, it was the rear main seal to the transmission.

Asked by for the 2001 Nissan Sentra
Assuming the transmission is automatic, the cost for parts and labor is $155.92.