If it helps, here's the landing page for Prime Day deals so far: https://www.amazon.com/primeday. Your best bet is if you're looking for a deal on something specific, add it to your Wish List. If it goes on Lightning Deal, the Amazon app will send you a notification. I can already tell Amazon is changing up how they're doing LDs, in anticipation for the quick turnovers.
There are some movie deals already. I bought the digital copy of Bad Moms for $4.99 (with the mountain of digital credit I've accumulated using slow-ship, lol).