The Vaporeon ex (110 / 113) card can be found in the Delta Species set.
Recently sold 3 times and based on those sales is worth around £31.99.
Currently, there are 15 open listings for this card on ebay.
This card sells in the range of £18.68 to £45.30, making it quite volatile.
This Rare Holo Ex card was illustrated by Hikaru Koike.
The fact that it is a EX card makes it one of the more valuable cards.