I see this a lot, and I just don't get where people are shopping that this is true, are you comparing it to Dollar Tree or something?
Amazon isn't as cheap as they used to be, but still competitive with places like Walmart and a far greater selection and stock. They're definitely cheaper than locally owned places, I've tried to shop local, but the best I've seen is still like double what Amazon or Walmart has it for
Also, I get the promised shipping time I'd say about 90% of the time even for same day items