But Amazon normally have several different suppliers listed. Which one will be selected to supply to you? Does it default to the cheapest?
I suspect behind the scenes, Amazon will have stitched together a system whereby different suppliers "bid" to fulfil any orders taken at the price Amazon set when the button what clicked.
After all, does it matter where your bin bags come from ? Or does it matter they are the correct ones you need ? (Would these be the ones that have letter codes like "K", btw ?)
And, yes, price is important to everyone. However, the demographic Amazon are targeting with this will be people who buy based on value rather than price. Which will be 80% of folk ? How many people do 90% of their weekly shop in one place, and then spend another hour and a half finishing off the last 10% elsewhere to save .... £5 ? Personally I'd rather have the extra 90 minutes - it would be worth the extra £5.
For all the gee-whizzery of the front-end websites, UK internet retailing is partying like it's 1996 at the back end (as a recent thread about how pisspoor Ocados picking system is demonstrates). Mainly because - like the record companies before them - they assumed they could transplant their 20th century business model of a 19th century paradigm into the 21st century. One of the things they are learning - painfully - is that you have to keep spending, year on year, to stay afloat. That is really invest. And of all the things the UK does well, really investing is not one of them. car industry. Hence a US company has to show us the way.
I had to laugh with hollow mirth when the government pretended by calling a road feature "silicon roundabout" they would magically invent Amazon or Google, or Apple in the UK. None of those companies could ever have started in the UK.