Wide seems to be very hard to find in any sort of cycling shoe, let alone winter ones. The only wide winter shoes I know of that come in regular and wide are the new Lakes. I have a pair on order, hoping I can fit my flippers into them. Unfortunately for you, they're an MTB shoe. Might be worth picking up a cheap set of pedals for them just for the winter though.
Edit: Just a generic Google for "Winter Cycling Shoes" turned-up
this page, which has shoes I hadn't known about before, including some three-bolt ones. Unfortunately, nothing about the width...
Here are
some more, but the same caveat applies...