B550 Plus Gaming + AMD 3800X help me price for a friend

[SpongeBob]

Long story short considering selling a friend of mine some hardware I don't live in the US. I have a AMD 3800X and MSI B550 MPG Gaming Plus and some ram. What is fair market value for the CPU and Mobo in the US? I'm going to give him 16GB for DDR4 for free so I figure I can price these out fairly.

Thank you,

 

[pendragon1]

with ram, $350. the chip, ram and board new are ~$470.