R4i-sdhc 3ds rts card is officially out of production and luckily R4-DS-AU.COM stocks the last 300 sets of these R4 3DS cards. And you could buy a backup one before no R4 card available.
1. Can I still use my R4i-sdhc 3ds rts card if it’s out of production?
Yes, you can still use your existing card with third-party YSMenu boot firmware, but finding replacements or support may become more challenging.
2. Are there legal alternatives to the R4i-sdhc 3ds rts card?
Yes, there are legal alternatives, but they do not offer Real Time Save/Guide functionality.