Hello, hello, I bought more plants.
Maybe it's a ferocactus? I can only guess since it didn't have a species label. :(
This one is new to me, Pilea peperomioides, aka Chinese money plant, aka pancake plant.
It's native to China (Yunnan Province).
And another new to me plant, Homalocladium platycladum, aka ribbonbush, aka centipede plant. It's from Solomon Islands and New Guinea.
Such unusual stems!