I have a pair of ridiculously expensive Vendramini Marathon Steel boots that I love. One bad thing about them is that the soles are fairly thin, and they finally needed to be replaced. My local shoe repair shop said he could not do it.
I had heard about Dave Page (http://www.davepagecobbler.com/) on other bike forums so I gave him a try. He did a really terrific job. My original soles were maybe 1/16" thick. The new soles are Vibram and a minimum of 3/8" thick. They also grip the ground much better than the original soles (like my bike's new PR3's!). This added grip makes it easier to back up the bike while sitting on it.
I recommend you give him a try before you toss your old boots out.
Despite the name, he is not a small one man shop. He's got a decent sized operation going. He specializes in mountaineering boots.