It's pretty easy to find competitors that are cheaper than amazon, but it's not as common to find ones who will ship as quickly and still be cheaper. (Even if y

It's pretty easy to find competitors that are cheaper than amazon, but it's not as common to find ones who will ship as quickly and still be cheaper. (Even if you exclude prime.) Also, why does Amazon seem to be the only site on the internet that will give you a guaranteed delivery date and refund you the shipping cost if they miss it?