Kingston buys its chips from either Samsung or SanDisk (they're the only manufacturers). Are they first quality or rejects? We can't tell.
SanDisk is quality, and if you
do have a problem (and I've been using their cards since they started selling them), you can go to
SanDisk microSD Tech Support, start a live chat and get the card replaced with no problem. (They even came out with a bug fix when Samsung messed up and the S3 started eating SD cards. Not their problem, but they fixed it anyway.) As Closingracer said, look on Amazon.