Mew ex #158 from 30th Celebration is a rare card that currently sells for about $51.33 ungraded, with graded copies ranging from $119 at grade 9 to $500 at grade 10. TCGrader's AI has graded 40 copies of Mew ex (30th Celebration), averaging 9.2 overall. 93% scored 9 or higher, so clean copies are common and centering usually decides the top grades. A grade 10 copy sells for around $500, about 9.7× the $51.33 raw price, so high-grade copies are worth grading.