Salamence-GX #SM139 from SM Black Star Promos is a reverse holo promo card that currently sells for about $13.25 ungraded, with graded copies ranging from $12.85 at grade 7 to $8.00 at grade 10. A grade 10 copy sells for around $8.00 vs $13.25 raw. That's a modest premium, so grading only pays off for near-perfect copies.