Hi murrayb1893,
I think it's because the term "vegan shoes" is not yet widely used among the suppliers. If you refer to those shoe items which are not made of leather, there are several shoe drop ship suppliers to choose from, only that they may also have leather shoes among their options.
I chose those that can ship internationally -
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I also tried to search outside of SaleHoo for this product and found one supplier specializing in vegan shoes. They supply wholesale but doesn't drop ship though -
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Hope this helps. :)