Well an auction went on NA for $54 last month but that was for a CIB copy. I would say just keep it and buy SM64, you would be losing money in the trade I would think
I am buying all Saturn games, PM me with your offerings and I will let you know if I need the game or not! (Everything must be CIB)
Currently trying to knock off all the sports games, would like to get them <$5 each! Of course if you would like to donate them I will gladly pay the shipping!
Joe at the NESDUMP sells it for $30 iirc. There are very few repros that should be more than $20-30 for NES. Repro Box $10-12 from uncletusk among others, and repro manual $7-8 from various makers.
You'll always find people who buy them direct from the repro makers and then sell for double on ebay.
That said, you've posted this same topic on multiple forums that you could have figured out yourself one of two ways:
A) what you paid for it
B) google