I know Amazon lies about their quantities.
They listed having 8 in stock when I bought mine; and it never went down (I checked multiple times per day). I highly doubt they got a shipment of one at the same time mine was shipped.
I'm pretty sure I saw postimgs about others buying at the same time.

That said, it's likely their auto-pricing algorythm going nuts again... you heard about the $23Million book, right?