I got mine from zolanta and you can get the acekards with memory cards as well if you like.
here's the link.
http://www.zolanta.com/auction_details.php...ction_id=114303
This hasn't happended to me but, because of the dsi firmware update and it blocking flashcards can you not just reset your dsi back to default settings. Does that make you able to play on it again.
Thanks