Don't make a beeline for the thing that you are interested in. Look at a few other things first, discarding them as options. Don't show you are really interested in something, ask the price of a couple of other things to get a gist for the way they do business (I really hate the 'whatever you want to pay' or 'good price, how many do you want' lines!) And decide what the item is worth to you (e.g. you can buy nice hamam towels this side of the Atlantic for $6 or $7 with no haggling)