Funny story.....
I bought the 8 camera system on July 1st at the full price of $999. They arrived on the 3rd. I quickly looked into the main box and made sure all the components were there and put it away. On the 4th I got the sale notice
I called Amazon to see if I could get the item price adjusted or what their policy was. The lady said, what they do is return the higher priced item for a full refund and then I buy the sale priced one for cheaper. There are free returns and shipping with prime. I told her i'd like to keep the system I got but she said the only way to get the sale price is to return the old system for a new one. She said it's how they work and they do it all the time.
The lady created and completed the return right then, emailed me a return label and even scheduled UPS to pick it up. Now I'm waiting on my new sale priced cameras to arrive tomorrow. I'm not sure how that makes sense to anyone, but I ended up saving $200 on the system.