Nintendo eShop Cards No Longer Digital Codes?

For some reason today, is it me or Nintendo is no longer selling eShop gift cards by digital code? I looked all of that on Amazon and Walmart.com, and of them ($5, $10, $20, etc.) were unavailable and out of stock for no reason! And you can only buy the physical ones (only $20 and $35 while $100 is only in Walmart.) What's going here? Don't believe me, type Nintendo eShop Gift Cards in the search bar of Amazon and Walmart.com!

How come no one else's commenting on this?