NAND was basically far too cheap last year according to any analysis I've seen, resulting in companies posting big multi billion dollar losses, reducing supply and laying off staff. If prices don't rise it's not worth them making the stuff.
Even if drive prices go up 50% on what they are now, they'll still be way below what they were for the same models a year and a half ago, in some cases at least. I'd say the sale prices a couple of months ago were unnatural lows, rather than the incoming being a temporary bubble.
It is the old supply and demand ploy. The companies will be holding back supply thus creating a fake shortage of SSD's. The result is self-explanatory.
Calling supply and demand a "ploy" is a bit like talking about it being "the old gravity ploy" when you drop something and it breaks. 'Just price' for everything is very much a
medieval concept, when they understood economics about as well as gravity.