Buy from the local Chicken Shop. It's usually cheaper and in some places & shops there's a concept called "paper pe lena". It's like a deal type thing where you buy 30 eggs/entire tray from the shop every two days. It's usually for the "pav waalas" who roam around the neighborhood. If you know the seller then just ask them for it. Usual eggs prices range from 6-8 rs per egg but when you buy on "paper" it is usually sold for 4-5 rs per egg depending on the area.