MacBook Pro replacement lid

Visit an Apple Store or Authorized Apple Service Center with your Mac for an estimate.

The field-replaceable unit from Apple is the entire top cover, including the entire display, so it will likely be quite expensive.

You may be able to buy just the metal part from someone whose Mac has died for different reasons (e.eg., water spill) and replace it yourself, or deal with a third-party portable computer repair service.

Be sure to use a service that is reputable. Third-party repair, if not done properly, may impact your warranty status.