Prices do that on amazon. I've seen them suddenly go back to normal.
Yes, and I've also seen those abnormally low prices on Amazon - even in supposedly Prime eligible items - turn into shipping dates three months in the future and then when that shipping date does arrive, nothing is shipped. Amazon then sends an e-mail asking if I want to wait for an indeterminate amount of time or cancel the order.
I'm still waiting for a Lee reloading press that was supposed to have been shipped in March 2016. With an unusually low price on Amazon, watch the shipping date and caveat emptor.