We were out of half gallon canning jars. You can't buy canning supplies anywhere locally, because the population has been inspired by Covid to think they should preserve more garden produce, and the jars, lids and rings are all sold out everywhere.
So, went to amazon.com, found a deal from one of their hosted retailers on a case lot, and ordered it. 2 and a half weeks later, a box in Walmart livery shows up on our doorstep. It's a case of half gallon canning jars, shipped directly from walmart.com to us.
I admit I paid a bit of a premium to Amazon to get the order - really needed those jars - but it must be a damn thin living to arbitrage between Amazon prime (no cost shipping) and walmart.com (paid shipping).