Jolteon ex #30 from Prismatic Evolutions is a holo rare card that currently sells for about $4.09 ungraded, with graded copies ranging from $11.00 at grade 7 to $60.00 at grade 10. A grade 10 copy sells for around $60.00, about 15× the $4.09 raw price, so high-grade copies are worth grading.