David tends to get great deals. He likely has 5 or 6 in stock. Its his thing. Likely selling oem parts or maybe demo parts given to him by manufacturers.
I would recommend it. The hubs are pretty well known and the rims look good.
As for shipping, fill out the form and check the shipping costs. You best bet. I have two huge boxes being shipped to whistler for 10$
No clue. I never go narrow on tires.