Does anyone else with big feet have a problem of finding designer stilettos?

I'm really tall at 5'11, and I love wearing stilettos because they help me straighten my posture and they exude elegance. But my feet are size ten and a half, and I always have to get the next size up in stilettos because they run narrow. Does anyone else know why all the cutest stilettos are in smaller sizes? I already go to Nordstrom, but are there any other stores that sell designer stilettos (Gucci, Prada, Yves St. Laurent etc) in larger sizes?