I ran a search for the type of products you're looking for and the women's footwear suppliers we have only carry up to size 12. Other suppliers listed below carry sizes 10- 11 as well.
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Make sure you contact them directly in order to get their true wholesale pricing which is always better than you will see on their site. When doing this, provide them with the quantity you are ideally looking for, where you want them shipped to, and how often you plan on purchasing - this helps gets the best possible price.