Blue laser pointers

When did blue laser pointers get so cheap? Right now you can get a blue laser pointer from Amazon for less than $8 (link).

I’m not sure these are legit, but the one I have (from Yugster) looks the same and works OK. It has a pretty wide beam compared to my green pointer, but it’s still very cool. Oddly, the blue pointer is the only one that seems to excite the glow-in-the-dark stars on the kids’ ceiling.

Does anyone know why some of these pointers are selling for $150 (link), and others are selling for much less?

PS: I should also note that this thing is much more powerful than its <5mW rating. It’s probably closer to 30mW. It’s definitely not a toy, and I’m pretty sure I shouldn’t let the girls play with it.