It has been said time and time again on this community. You really will find it hard to source authentic Nike (in quantities) unless you are doing so through authorised channels. To source them from authorised channels you really need to have a brick and mortar store or a connection within the industry. There are people that manage to get hold of liquidation/closeout deals but you should be wary of any supplier claiming they can access large quantity's and variations of stock on this or any other major sports brand.