The Voltorb (67 / 102) card can be found in the Base 1st Edition set.
Recently sold 2 times and based on those sales is worth around £27.16.
Currently, there are 18 open listings for this card on ebay.
This card sells in the range of £12.75 to £41.57, making it quite volatile.
This Common card was illustrated by Keiji Kinebuchi.