So, I saw an unlabeled Lithops for sale at the general store for just $2, and decided to grab it up (along with another mystery succulent that looks like the Sarlacc from Star Wars, but if it was green and all mouths with spines). Since my tablet doesn't do pictures very well (colors quite muted), I was wondering what the most common species commercially available were, so that I could narrow down what this one likely is.