Porygon #137 — ポケモン中国151コレクションカードの価値

Which version do you have?

If your goal is simply to own Porygon #137, buy the Standard version for $14. The Reverse version at $2 offers minimal collectible advantage, primarily being a different print run rather than a significant edition or packaging upgrade. Casual collectors should stick to the cheaper Standard version, while serious collectors seeking a specific print might consider the Reverse, though the price difference is small.