You know that game cards can be purchased from popular retail outlets across US but is there any online version of for people outside the US?

Please provide me with the name of the game you are referring to. I need to know what game you are asking about in order to tell you if there is an online version for people outside the US.

For example, if you are asking about "Magic: The Gathering" cards, I can tell you that there is a digital version called "MTG Arena" that is available worldwide.

Once you tell me the name of the game, I can help you find out if there is an online version available outside the US.