Nidoran ♀ #82 from Base Set 2 is a common card that currently sells for about $0.85 ungraded, with graded copies ranging from $6.90 at grade 7 to $21.50 at grade 10. A grade 10 copy sells for around $21.50, about 25× the $0.85 raw price, so high-grade copies are worth grading.