What happened to the full Peridise set?

I just decided to wander around the store to see if there was anything new, and I noticed that something was actually missing. The full Peridise set isn't available anymore! Why not? I've always wondered why there wasn't an advanced set available, because when you find you like the bigger two, you'll want the smaller ones too (I use the two in the middle. smaller one for sleeping with). But most people don't upgrade because they'd be buying two they already had. So now instead of adding an advanced set and increasing their profits, they just cut those two entirely by dropping the full set? It doesn't make sense to me. Is the company in financial trouble or something? ...Well, whatever is happening, you can still get them over at High Island Health...for now.