Called a “desert gem cactus”. They remind me of Skittles :)
I saw all of these at my local Home Depot when I was there picking up paint for our front door. All were $10 or under (so I won’t be heartbroken when I inevitably kill them). I picked up a Eugenia topiary and a new succulent.
Speaking of the front door, it was installed last week and I’m working on putting the final coats of paint on it today. I like it so much better already.