For modern cards, I think Yermin Mercedes's prices were the most shocking. After his hot start last year, his rookie autos shot from $5-10 up to $200+. The modern market has always been reactive, but that was insane for a 28yo rookie.
Vintage-wise, the Sanella Ruth has exploded as people seem to realize it's best option for a budget Ruth. PSA lists low-grade selling in the $200-250 range back in 2019, compared to recent sales from $800-1000.
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