It might be possible to find those sizes in a larger city. You don't want to shop for shoes in a smaller city (inaka) anyway. The clothes and shoes they sell are largely geared toward old ladies and farmers (aka curtain's from the 70's sewn into aprons and dresses)
You could always just buy from the men's section. I honestly can't tell the difference between the two styles honestly. The men here are all about being "pretty" and in fashion! lol
You might be better off bringing a few pair with you to last you until your next trip to the states.