I live within 5 miles of half a dozen Amazon fulfillment warehouses. Many items I order are eligible for free same day shipping. I routinely and soundly beat the prices of eBay sellers by shopping around the marketplace sellers on Amazon. The website is I think deliberately difficult to navigate-- why would they want you to immediately find the lowest prices? Retail stores intentionally lay out their floorplans to funnel shoppers into impulse buying.

Besides, I'm not going to order from a UK seller to save $2 and add a week's wait, or order from China/Taiwan to save $5 and wait a month. I'll pay the little extra to have it within 48 hours.