just remember to add in the shipping... mounting...balancing when looking at the online numbers.. They look real good until it's time to get them put on.. I have not looked at them lately , but a few years back I needed to replace 2 on the road and had to pay close to $400 each.. OUCH
Per the link you provided - -
Tires - $319.99 ea.
residential shipping - $19.05 ea.
total - $339.04
tax - 79.82 or $19.95 ea.
grand total-$357.99 ea.
Then add mounting and balancing locally... Just make sure you are apples to apples