Any suggestions re shoe covers suitable for commuting. I've had a hard time finding any as most seem to be made for slim-hipped, pixie-footed road cyclists looking to squeeze every last bit of aerodynamics and weight out of everything.

My requirements:
1. Easy to put on without taking my shoes off. I normally carry them in a pannier when I'm expecting rain and want to put them on fast.
2. Proper sizing for size 12 MTB shoe, normal width.
3. Durable sole
4. Reasonable price ($100+ is not reasonable)

I've found these online -- Endura - Products -- but can't find a local supplier and am hesitant to order due to sizing uncertainty.

What's your experience?