I was looking for an Anvil for about two weeks now, being the only component I was missing to start knife making. Two days ago, I was helping my neighbor clean out her moms house. (40+ years living there, husband was a jack of all trades and had a bunch of cool stuff.) I finished moving all the things that she needed, so I was able to look around the house, and there was this old shack at the back. So I go and check it out, some cool antique tools, and some random pictures. Move the picture, and lo-and-behold, there's a 50+ pound anvil sitting on the floor. And that's partly why you can't find them, because people put them away and forget.
And I'm residing here in Clinton, MS. So just ask around! Lots of farmland, plenty of old families who know tons of people. Just be digilent, and when in doubt, just make do with what you have. I would have killed for an I-beam just so I could get started,