This site has lots of Nike, Adidas and Asics footwear. Link hidden: Login to view
Their website states 'We guarantee that shoes we sell are 100% genuine and authentic!' International shipping is offered and you do not need a tax id to purchase from them. Link hidden: Login to view
has a good range of Adidas and Nike footwear and they are located in Australia so shipping prices should be reasonable. They also have a 5 star rating in the Salehoo directory.
You may like to have a look at this wholesaler. Link hidden: Login to view
They have shoe closeouts that include Nike and Adidas footwear. They have a 4 star rating in the Salehoo directory and ship internationally. Link hidden: Login to view
is a supplier of athletic overstock and floor sample footwear. They have a 3 star rating and ship worldwide.
I hope this helps and you find a good supplier for your business.
All the best :D