Where can I buy the Game Reader for this device?

I bought a new Nintendo 3DS 2015 game console for my son. After a few months, it won't read the game cartridges. I checked the pins on the game reader and they are damaged. Tried ti fix them by aligning them correctly and it worked for a few days but now it won't read games again. I want to replace the game reader for it to work again correctly. Checked the tutorial and it's excellent but I can't find a place where I can buy this part so I can replace it with a new one. Can anyone help me with this?.

Thanks for any help you can bring me.