Next time you come across something you really want ask the guy if his listing is O.B.O. (or best offer) Then offer him $600 on the condition he doesn't sell it in the amount of time it takes you to load up and drive there.
Be clear on when you will be there and have an understanding that if you are 1 min late there will be other vultures there waiting. At that point he "should" be telling people that someone is on the way to pick it up, if he flakes then I will call you back.
I went to Tas iron the other week to meet Tim. Tas is about 20min away from were I live. It's located in Bera, that's roughly 4hr drive north from Cincinnati. Tim didn't seem like a bad guy. The shop is impressive. He's definitely the 10EE guy.