Koffing #70 from HeartGold & SoulSilver is a reverse holo common card that currently sells for about $0.75 ungraded, with graded copies ranging from $10.51 at grade 9 to $41.97 at grade 10. A grade 10 copy sells for around $41.97, about 56× the $0.75 raw price, so high-grade copies are worth grading.