I am going to disclose a trick before you to save delivery charges while shoping on flipkart, suppose you are about to shop a product worth Rs 300 on flpkart but along with this you have to bear delivery charges around rs 40 to rs100, depending on the products it may vary.
To save delivery charges search other products so that your total amount in cart reaches value of rs500 or more , items should be fulfilled by flipkart assure after placing order at the time of deliver you can reject the other item and take delivery of the item you have selected initially.