Jolteon ex #30 from Prismatic Evolutions is a holo rare card that currently sells for about $3.61 ungraded, with graded copies ranging from $10.65 at grade 7 to $25.00 at grade 10. A grade 10 copy sells for around $25.00, about 6.9× the $3.61 raw price, so high-grade copies are worth grading.