Most valuable games you own?

[Signalstar]

In 3rd place is my sealed copy of Super Mario 3D All-Stars going for $120. Twice the original MSRP.

My only regret is that I did not have the sense to buy a digital copy as well so I could play it on my Switch. Especially since I haven't played Mario Sunshine yet. I my friend's digital version thanks the the Virtual Game Cards feature, but didn't manage to beat the game before it reverted back to my friend.