You’re right: Samsung is no longer making smartthings branded devices or hubs.
However, they are partnering with other companies to make them, in some cases they are the same device is just with a different logo. They might be at a different price point, though.
Aeotec is the hardware partner for the US and the UK/EU. Most of their devices are already available in Europe. Some have been released to the US and the rest are expected to arrive pretty soon. So if there was a particular smartthings model you really liked, you can just wait for the Aeotec version. But again, the pricing may be different.
Otherwise, you can just check the forum for discussion of other brands. I know there’s a thread on cheap contact sensors. There was also one just this morning on water leak sensors.