Haggle....mentally put a price for yourself in advance: how much do I want to pay for it. The first bid you do should be ridiculously low...after all, the vendor's price is ridiculously high in the first place. He will set a new price...you now both know you're in for the game. Start haggling down and be overly dramatic about it...ask special discounts if you buy more than one item, make a total price. Threathen to walk away, you'll be called back with a new price...yet know that if you indeed walk away, don't come back for the same item. Because then the vendor knows you're interested. Let your travel partner/spouse play the bad cop, as if she/he doesn't want you to spend that much money on the items. The vendor will often his price to meet the spouses' criticism. Watch out what you say to one another...even in your own language. The vendors speak much more languages than you'd imagine. Stop when you're both happy on the price...and have fun.
That way both parties will be satisfied about the deal. There's no use in angering vendors by trying to press for ridiculously low prices.