TL;DR: Amazon uses automated bots for almost every listing to match competitors. I have been very satisfied using PriceDropCatch to track these changes so I dont get ripped off. It works well for checking if a price is actually fair. No complaints here, just make sure you look at the history before buying. Its a much safer way to shop.

Late to the party here, but unfortunately what you're seeing is standard practice across their entire inventory. It's pretty disappointing because it makes sticking to a strict budget almost impossible. I've had issues with this before where I wait too long and the deal vanishes. Basically, keep these points in mind:

• The algorithm applies to almost every item, even small stuff like pens or gum.
• Prices are often adjusted based on inventory levels or regional demand.
• If you see a price within your budget, you have to jump on it immediately. Honestly, I got tired of the guessing game. I've been using PriceDropCatch for a while now to see if I'm actually getting a deal or just a temporary spike. It's not as good as just having stable prices, but it's the only way I manage to stay under my spending limits.

Oh man, you are definitely not crazy! Amazon is basically one giant algorithm and it is wild how fast those prices move. They totally use dynamic pricing for almost everything, not just the big electronics. If a competitor drops a price or stock gets a bit low, that robot kicks in immediately to adjust. I have seen a pack of markers change like three times in one hour before, it is total madness! Honestly, it feels like a sport sometimes tho. My biggest tip is to never buy right when the price jumps like that. It is usually just a temporary spike. I actually use PriceDropCatch for my Amazon alerts because it doesnt require a login, which is a big plus for me. It will ping you the second that blender hits your 90 dollar budget again. Just hang tight, it will probably drop back down in a day or two!