I'd say run it back through that field backwards and hope that whatever bent it will unbend it!!:laughing:
In all seriousness, I'd say your options are:
A metal/blacksmith shop to straighten it out. Its gonna need heat.
Maybe the same shop would have equipment to make another one.
EBay or Craigslist to see if anyone is parting out a plow.
Junk yard or metal recycling place where someone might take an old plow for scrap.