Jolteon ex #30 from Prismatic Evolutions is a holo rare card that currently sells for about $3.99 ungraded, with graded copies ranging from $11.00 at grade 7 to $64.99 at grade 10. A grade 10 copy sells for around $64.99, about 16× the $3.99 raw price, so high-grade copies are worth grading.