So, I guess it's like confirmed that if you tried and failed to obtain the MM n3DS in-store at GameStop you can still get it in store. People have done it and I just saw this in my inbox:
Our records indicate you recently tried to place order ### in one of our stores, but experienced trouble when trying to provide payment. We sincerely apologize for the issues concerning your order, as well as for any frustration this has caused. A GameStop representative will be calling you to resolve the issue and fund your order by close of business on Monday, January 19th. Please note that all orders must be funded by this date. Orders not funded by close of business on Monday may be canceled. If you do not wish to wait for a call from us, please feel free to call us at 1-800-883-8895 for assistance. An agent will be standing by to assist you with your order.
Your business is extremely important to us. Thank you so much for your understanding and patience while we resolve this issue.
Always remember that we are here for you. You may reach us at 800-883-8895. Our hours are 8 AM – 10 PM CST Monday – Saturday, or 8 AM to 8 PM CST on Sundays.
Have a wonderful day,
Your friends at GameStop.com"