Anyone know where I can find a wheel arch replacement panel for an 03 Ram?

I know it's not an a-body, but Im trying to help a friend fix a rust hole on the left side wheel arch on the bed of his 03 Ram 1500. Does anyone know where I can get the best price on a replacement panel? It's too new of a truck to find in a junkyard around here and I don't want to trust a random website unless someone has had previous experience with them.
Thanks in advance!
Matt