How much does a gearbox issue cost?

Excuse me, could you possibly elaborate on the cost implications associated with a gearbox issue? I'm curious to understand if there's a general range or if it varies significantly depending on the severity of the issue, the make and model of the vehicle, and perhaps the location where repairs are being carried out. Additionally, I'm interested to know if there are any factors that could potentially affect the cost, such as the availability of parts or the expertise required to carry out the repair. Thank you for your time and consideration.