It has nothing to do with market fluctuations. I've been using CamelCamelCamel for years now, and you can see wild fluctuations on an hourly basis, sometimes by more than 50%.
Amazon and its sellers do A/B testing of price points all day long, and if you're just a casual shopper that happens to want the product at that time specific time, you may end up being unlucky, and paying a few bucks (or sometimes dozens) more.
Amazon and its sellers do A/B testing of price points all day long, and if you're just a casual shopper that happens to want the product at that time specific time, you may end up being unlucky, and paying a few bucks (or sometimes dozens) more.