Hacking R4i cards on 3ds xl

[cSwanxx]

Hello, I had this on my mind for a while and wanted to confirm if the r4i/dstwo cards are still working on the 3ds xl system? if so, do you know a trustworthy site I can order from (you've tried w/o any issues)
Also, what's the best card that can still be used with the new games?

ps. I had a dsi card 5 years ago and I recently found it and it's not working '

I appreciate your comments, thank you very much <3