You are asking an 'impossible to answer' question.
Where are you for starters and what is you market place?
Where is the gimbal broken and how is it broken?
Does the camera work etc., does the drone power up etc. ?
I have an
M2P that externally looks ok but needs a rear arm replacing. That means splitting the shell, for me that's quite an easy DIY repair but for someone else a nightmare.
Look in your 'local' ebay for "for parts
Mavic 2 Enterprise thermal", once you have the search results click on the "advanced search" button and then, there, the completed auctions button. Prices in green sold. With out further details you are selling 3 batteries, a
smart controller, a speaker and spotlight and that's it.
The drone might range from complete scrap to a cost free repair where the gimbal just needs reattaching.
My suggestion, send the drone to DJI for a repair estimate.