I have a nice driver's side 73, no major damage, just some light surface rust, but I have no idea how to ship a fender. Looks like $100 at least from me (59801), I would sell it for $75. If you want I can find get some pics Sunday.
Moser charges $52 in shipping for a single 8.75 axle to my door according to their website. I have a BBP 7.25 as well in Montana. Weigh the one you have out already and let me know how much it weighs and I can try and give you an idea for what shipping would be.
The kicker would be could you fit it in a flat rate box? I'm a letter carrier and would love to deliver Mopar parts all day. The guys really beating the system are the reloaders getting 70 pounds of lead in a medium $11.25 flat rate box.