It would be nice, if there was ONE simple answer....
Each internet site, has it's deals, and it's not so deals.... the deals vary by dealer, and by brand, and often by model.
I'm a Jake Wilson fan... been so for a while, but now my local indy, will be close enough to JW's price, as to not make it worth the wait.
If you're going to mount the tire yourself.... well then price is KING.... but if you are having the tire mounted, ask around. I've found many shops will match the intenet price, if you show a printout.
good luck