How much is a PAL UK new & sealed super mario 64 on N64 worth?

Hi there just wondered what the game mentioned in the title is worth new & sealed. Super mario 64 the PAL UK version on nintendo 64?

I would like to sell mine but no idea what to value it as?

Thanks

Only advice is to look at ebay. Don't look at all the auctions though, look at what has been sold. You could probably get a hefty penny for that.

I did look on ebay but there is none sold. :(

I did look on ebay but there is none sold. :(

keith500