I will sell the kidney and sink it.

We would like to inform that It is absolutely forbidden to donate kidneys for a financial fee because paying money for a kidney purchase is illegal
Here is the text of Federal Decree No. 5 of 2016:
Article 5:
it is prohibited :
-sell or buy human organs, all or part f them, or human tissue by any mean or to take money for it in return
-to conduct transferring or transplanting operations, or to participate in them in case it they are violating the provisions of this law
- to advertise, announce, promote or mediate the unlicensed transplanting operations for all or part of the human tissue or organs
-Financing transplanting operations for all or part of the human tissue or organs once a person know that the donator has been paid to donate.