There's also the problem of where things are being shipped from, they could in a warehouse down the road, or coming from the other side of the world. For someth

There's also the problem of where things are being shipped from, they could in a warehouse down the road, or coming from the other side of the world. For something regular/you shop often at, entering your shipping address to have shipping costs appear as you shop might help, but if it's a one-off, or you're trying to price compare and you don't want to enter your details yet, then that's much harder.