I have learned to "stalk" Amazon. I put something in my cart and then "save for later" - and watch the prices change. I have seen some unbelievable price swings.
I do this for Amazon and Walmart. I had a Go die in my cart for a few months at Walmart and one day I got an email saying some items in my cart had a price change. It dropped to 60% off. Amazon does not delete your items and I don't think Walmart does either.