Tire Blowout Where to Buy fender skirt

[smitty082261]

I have a Keystone alpine 3555RL and I had a tire blowout this past weekend on our way home, the trailer is about 11 months old and the tires had about 1500 miles on them. When it blew it tore up the fender skirt and the aluminum side near the tire. I went to my Keystone dealer in League City TX and they told me that the 12' section of J aluminum strip which i only need 3' of would cost $100 just to ship it and the fender skirt would cost $40 to ship, that does not include the cost of the components. I find that unreasonable and want to find another place to purchase these items. Can anyone recommend a place. I will attach photos.