End of story, guy wanted 30$, I offered 20$ or return the item, he said 25$ will do, I accepted.
I know I shouldn't have, but since I needed to pay the return shipping anyway, I figured 25$ was close to what I would have paid to get the item back, and then the hassle of reselling it again would have cost me a lot more time in the future, and repacking it again etc.
FYI, buyer was venom786 and he seems to be buying lots of retro games. Based in the UK. I have him blacklisted.