When you go to your LFS you need to actually ask for them. What I have found is that when I am wandering around checking the tanks, I never see the hastatus or pygmaeus. It is not that I don't recognize them immediately, since I have all 3 types at home, it is that they are small enough that 20 or 30 can easily hide behind an ornament and you will never notice them. The habrosus are not as bad at this as the pygmaeus and the hastatus but they are also quite capable of hiding just like the rest.