Why do prices vary so much?
Because the world is cruel, but mostly because of margins, origin, and gear complexity. A box made of aircraft-grade alloy with a NASA-level chipset will naturally cost more than a mass-produced piece of molded plastic. It’s the difference between a Swiss watch and a toy watch found in a cereal box.
Technically, variations are explained by electronic components (proprietary vs. generic chipsets), build quality, and import fees. For liquids, marketing, packaging, and laboratory certifications directly influence the final price you see on the shelf.