I'm in with Fred, and I feel your pain--I couldn't even find a RR chunk locally to make an anvil and been on my own hunt...and still hunting.
Until recently, I think the last chance I "had" was a Vulcan around the same time (and make) as you last summer. I know you probably keep a hawk's eye on CL and other local "flea-sites," but have you checked with Golden Anvil Ironworks in your region to see if they could help you source an anvil or grind a flat area for you to work. As Fred suggested, You could leave a section crowned to serve as a bick. And at the same time, if they do true ironwork, they'll at least be commiserate to your plight and charge a pittance (if anything) to do the squaring.
Good luck in your hunt brother. If you want, I'll set some google alerts to let me know of any anvil postings from the bay, to Modesto, to your Fresno, and L.A. (I've heard they crop up there every now and then). Otherwise, and so help me, if I find my holy grail (200# or better) I'll work something out with you for mine (a 70# Columbian).