Ask for more than what you want.
It is human nature to want to negotiate and make deals. The price given is never the final price. There is always room to barter and negotiate.
If you are a salesman then start with you most expensive items first. The customer will see these enormous price tags and be blown away. Then show them what they really want. When they see this more average price it will feel like a whole lot less than just going with the average price first.