What are some popular non-traditional or niche sports card releases, such as those featuring mixed martial arts (MMA), wrestling, or Olympic athletes, and how do they compare in popularity and value to more traditional sports cards?

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14 hours, 31 minutes ago in Sports Cards - Other

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What are some popular non-traditional or niche sports card releases, such as those featuring mixed martial arts (MMA), wrestling, or Olympic athletes, and how do they compare in popularity and value to more traditional sports cards?