@vwestlife Yes they did, and I saw them #retail in #Germany at #ConradElectronic but they quickly flopped for two reasons:
1.
The #hinge mechanism made them fiddly to insert into devices, as that design isn't up to #SD spec which expects a ridgid body.
2.
They costed more than an equal-capacity & speed card plus a #cardreader.
3.
Basically everyone who used #SDcard already had a #CardReader and #USB #flashdrives were also cheaper than these things.
The only person I knew that used one was someone who fiddled with an original #RaspberryPi|s a lot and they used it with a USB cable permanently plugged in so they can quickly access the files when the Pi is shut down.