Sellers incur relatively higher shipping costs on low value items. In such cases, charging a nominal delivery charge helps them offset logistics costs. The delivery charge may be waived off by some Sellers, if you shop with them for a minimum predefined value.
For example, seller WS Retail charges Rs 40 for delivery per item if the order value is less than Rs 500. While, orders of Rs 500 or above are delivered free. Please check with individual Sellers to understand their delivery charges.