Bargaining is an art. But unlike artists, bargaining saves money. We, the people of India, go to great extents to save our paisa. Here are a few tricks I've noticed people using, every time I'm dragged to the market to 'shop'.
Even if your friend is having an asthma attack outside the shop, you act like you don't really need the inhaler so much. You just happen to like the design toh socha dekh lein.
If there are customers around, you start complaining about the service. Embarrassed shopkeepers then give you a discount and leave you at the door with fake respect.