While some people dislike Ghillie Brogues and other people love them, the OP's question was where to purchase wide Ghillie Brogues.

Without getting into a debate on the + / - of Ghillie Brogues, I'll simply say that a few of our sponsors may carry them, including yours truly:

http://www.usakilts.com/glenfinnan-ghillie-brogues.html