I think the person who got the $319 from his dealer because He bought the car from them. $349+shipping sounds about right. I bought them form
www.nissandiscountparts.com from Arizona.
edit: This is weird, this is not the same place I bought mine, but they offered even better deal, 25% off, no shipping (over $100). The one I bought from is in Arizona.
edit again: Found it, this is the place I bought mine from
www.directnissanparts.com . But I think the one I mentioned earlier may have better price. They may not give free shipping to oversized items.