Where can I get a new DS game card?

See, my dog accidentally chewed my pokemon game but the game still works perfectly. However, the probnlem is that it takes a long time to put the game inside the DS and to take it out. So, I was wondering on how to get the a new DS game card so that I can put the memory of the game inside the game card so that the DS does not have a problem reading it. I will really appreciate it if anyone can help me out.

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