Squirtle #SWSH233 from SWSH Black Star Promos is a reverse holo promo card that currently sells for about $10.09 ungraded, with graded copies ranging from $15.29 at grade 7 to $19.99 at grade 10. A grade 10 copy sells for around $19.99, about 2× the $10.09 raw price, so high-grade copies are worth grading.