The price's on website for that size tire is for the to say "popular" tires.
If your looking for something for less than about $200 a tire you'll have to look at not such a popular tire or name brand tire.
I suggest you go to a local tire shop in your area and look to see what they can get for a lower price in your size. They can a will sell the "popular" brands, but usually carry lower brands at lower prices. Plus your helping out your community where you live.
Another thing to take into concideration is "metric" size usually run alittle higher in price than a "standard" size tire.