I love this latest idea from Amazon.com: pay $79 per year and you get two-day shipping on everything you buy with no shipping charges per item. If you join "Amazon Prime" (reminds me of the Bezos Prime joke from Mike Daisey's 21 Dog Years: Doing Time @ Amazon.com) you can upgrade to overnight shipping for $3.99 per item.
They even offer to ship stuff out for next-day delivery if ordered by 6.30 pm Eastern. This reminds me of those glory days in the early 1990s when a few Macintosh firms had insane overnight delivery by co-locating warehouses with an Airborne Express hub in Ohio. Was it MacConnection? I'm blanking out on which ones offered this.
A few times, I would order right up against their late-night limit--I think it was 2 a.m. Eastern--and receive the item by 10 am the next morning (Pacific). Tremendous.
Now, I'll sign up for Amazon Prime. It will absolutely save me shipping costs. (I can add my wife, too: the Terms of Service say so! "...you may also invite up to four eligible family members living in your household (at the same address) to register for Prime membership at no extra cost.") I have had to order a few 2-day and overnight items in the last year; shipping for those items was probably $40 or more alone. And many times, I choose the ground delivery not Super Savings (free over $25) because I need something in a few days, not an indeterminate period of time that might be two weeks.