Make it to a game. And use the phrases actually the Asian uses.
Start with 60% of the price. For sure the people will be shocked. Anyway, while the retailer offers you now only 5% off you will go up with 5%. The retailer most likely goes down to 10% or 20% and will tell you that he can't go deeper. Now worries, offer him 1% more. Make it a little bit exciting. And 1% is something nobody ever expected. The retailer might go down more.
Tell him a story, example:
My Holidays are already over and I'm total broke, but you really want to bring something back for your old Grandmother or anything. And ask him for help, as you really need to buy this but actually can't afford it. Make it a little funny.
If the retailer still don't want to give you the last price you offered, walk off. To 99% they call you back and offer you are price near your offer. Don't accept it, give your last offer again and walk off. If they call you back you will get your price and by 99% they call you.
On this way I was able getting items offered for 100 for 45 or 50