High end discount store which sells online & also has many stores across the US. They've tons of 11 and 12s online, with some 13s and even 14s too. Size selection in store may not be as good as online though. See their current & upcoming daily flash events here where you can grab big deals for a short time. It's worth checking the main Nordstrom site shoe department too which also goes up to size 14. They've a bigger range of large size shoes & often have some great deals too.
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Updated . Check official Nordstrom Rack size chart for definitive sizing.
Lots of Shoes in your Size!
Find large size shoes all around the world in the big shoe shop directory.