Walk Behind Lawn Mowers

I'm having trouble locating a replacement front baffle.  I hit a tree root while mowing which displaced the front baffle enough that it came in contact with the blade, which made a tear in it.  I was able to bend the baffle out of the way of the blade, but I would like to replace the baffle since it isn't mulching quite as well as it used to.  What is the easiest way to get a replacement part?  eBay, Amazon, and Google have failed me.