I am currently planning my X-mas gifts (i like to start early

), and for my little sister i am definatly set on a DSTWO Supercard. Now i tried to get one from a retailer, and the thing stop working after 1 week of use (she is very cautions with electronic stuff, has she's old enough to realize these things brake easily, so i doubt it was misuse. Thing is their support was terrible, and i didnt even get a response out of them. I was wondering where I can buy a good supercard dstwo for the latest 9.0.0-20 U system, btw I'm from United States, and what is the best flashcart out there, my friend recommend me this wood r4i gold card
http://www.r4is.com/r4i-gold-3ds-rts-best-r4i-3ds-card-for-3dsdsids-lite-p-1.html, which one should I buy? any help will be appreciated.