... I have gone from an 9 EEE to 9 1/2 EEEE.Not an easy foot to shoe but especially difficult to boot.
I am like wbtravis going with what fits best.
I've heard good things about this New Zealand boot maker
From the website, it appears they'll make a extra wide boot for you for the same price. The McKenzie is $235, which considering that includes shipping, is a good value for a hand-made boot.