A small tip which has worked for me twice. If you buy something on Amazon and then the price falls, and you haven’t opened/used the item yet, echat customer services, and say you’re planning to return the item and rebuy it at the lower price, but you don’t want to cause Amazon the hassle of processing the return, so would they be able to simply refund you the difference? The two times I’ve tried this, I’ve succeeded both times. I think both times they initially said “no” but persuadable.