And from an American seller? I'm sorry if this comes across as a bit lazy, but I've never bought these types of things before and I don't even know where to begin.
If all you want is playing nds games or homebrew,r4i gold from r4ds.cn is a good choice , supported by wood team, with a top game compatibility and price is hard to beat . Now N3ds firmware has been updated to v9 2.0,r4i gold 3ds can directly work on it as well.
r4ids.cn is the site he meant.
it's cheap but the build quality is shitty which you will face issue like the card not recognizing the microsd that you have to reinsert it many times to get it working. slight nudges on the system and your game freeze. poorly constructed microsd slot or contacts, don't really know which one is the real cause. if you were to switch to a different game and ejected the card, maybe just a little contact with the microsd card, the next time you put it back to the game slot you have to remove it again and blow air onto the contacts or into the microsd slot, keep on reinserting until you find the right 'position' to get it properly recognized by your ds. better spend more on a more reliable one for longer-term usage. definitely not recommended to get the r4ids.cn card.