I add items I want to my wish list on Amazon and also use the Honey extension to Droplist any item I like so I get a notification if the price falls. Prices on pretty much everything change by the minute on Prime Days, so you have to be ready to pounce when something gets marked down.
I'd been looking to get a new 8" Fire tablet and broke one of my own rules by getting it earlier, but HSN had them on sale for $59.99 and then they sent me a coupon for $10 off anything, so my final cost for the tablet was just $53.30 after tax. I'll be peeking at the price on Prime Day, but the $49.99 is typically Amazon's lowest price for that tablet also.
Fly!!! Eagles!!! Fly!!!