"What the hell did you do that for? Given that the internet has given you access to a world wide market , it'd be a coincidence if the best deal was at the local independant retailer - and also it was a carryable size item, ideal for posting."
It depends on the purchase and how you do the carrying. Yesterday I went to a local independent builders' merchant to buy some stone product. I carried it home by car. I'd dread to think what postage might be or how it might be managed (70 stones, each individually wrapped and posted?) but delivery by the vendor would have added nearly 20% to the cost.