I would rather do all my tire buying from one place. I have found that Motorcycle Superstore generally has pretty good prices although rarely the lowest out there. They will, however, price match with anyone on the 'net. A couple of days ago, I was looking to get a Metzeler Interact Z8 front for my bike and a ME 880 front for a friend's Goldwing. I called up their customer service people and they matched the Rocky Mtn. ATV price for one of the tires and Southwest Moto for the other. Saved $25 or so in total. These guys generally have pretty good stock and ship promptly.
Ross