The sum is all that matters. The rest is just a weird number game. As you say, your store preference depends on various factors. If C’s shipping costs are stru

The sum is all that matters. The rest is just a weird number game. As you say, your store preference depends on various factors. If C’s shipping costs are structured one way, you’ll prefer them. Another way, you won’t. You have to know all those details before you can choose. That’s my point: ultimately, functionally, there is no difference between a random store that won’t show you prices until you give them your location, and a ransom store that shows prices immediately but won’t give you shipping costs until you give them your location.