Is there anyway to get Nintendo Network cards digitally?

[POE]

yep!!
http://www.play-asia.com/nintendo-prepaid-card-us50-for-us-network-only-paOS-13-49-en-70-5qmj.html

http://www.play-asia.com/nintendo-prepaid-card-us35-for-us-network-only-paOS-13-49-en-70-5qmf.html

http://www.play-asia.com/nintendo-prepaid-card-us20-for-us-network-only-paOS-13-49-en-70-4aqx.html