I own a M3 SD version. There are many slot 2 cards out there. M3 cards are more expensive but are known to have the best GBA compatibility out there. If you buy a slot 2 M3 or Supercard, you might need to buy a Passcard or Passkey thingy. Since you already own a M3 card, you'll know that it's pretty easy to put DS games/homebrew on it. It's basically as easy to put GBA stuff on a slot 2 card (at least in my experience.)
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