This is a fairly common sports title for the SNES. I would say that a boxed copy would go for $5-$8. If you said it was not in the best condition, it will probably be worth the lower part of that spectrum. SNES sports games just aren't worth very much. There are some collectors out there who will pay a little for a complete copy of a non-rare sports game, but those collectors generally only buy the ones that are in super good condition. Even then, you'd be hard pressed to find someone who would pay over $8.00 for a common sports game, even a complete, nice-looking one.
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