Thoughts
Slower shipping options used to be cheaper because they would send it across the country in a slower truck or whatever, but the logistics
chain is so efficient now that I bought something off Amazon with 1-week shipping; they didn’t ship it for a week, and it arrived the same day that they finally shipped it.
That’s not to imply that the cheaper shipping is a scam, I’m sure there are advantages on Amazon’s side to having a week of flexility around when to ship my package, but it’s funny that travel time is a negligible part of the equation (in this specific case).