A great many of the Paul Stuart shoes are, or seem to be, made by Crockett & Jones, and are listed on their web site at about $500, a tad less than Mr. Stuart's prices. Didn't see the ghillies though. That said, I suspect they may be available from someone like Trickers on Jermyn Street.

As to the cost... Ben Franklin was right when he opined that quality remains long after price is forgotten. given a modicum of care those $700 ghillies will last 20 years-- whats that? $35 a year? Less than TEN CENTS a day? Seems cheap enough to me.