As above said by the expert, Flipkart never sell most of the items directly to their customers who booked via online source / website. Most of the items are booked online by the customers which re-routed or copied to the associated seller where they get the notification and action upon. The only thing you get to go ahead is, ordering and paying to FK wherein as turn they get their commission and transaction follow up first and the rest go to correspondence seller.
The seller ensure that the product is delivered within the committed duration or else they would notify whether the product is available or not. However, most of the products from sellers are reliable except handloom items wherein some quality may arise subject to distributors or region wise or one can't confirm the brand.
In your case, yes, those shoes can be sold to lesser price just because of Flipkart's direct contact with manufacturer or main dealer, so, they get enough lesser or cost price and profit accordingly. The sales is depend on flows of the product, the more flows of the product the more chances of lesser price beside direct business contacts with manufacturer or main supplier. On the other hand, the rare selling product comes with good discount price too.