I was recently watching a you tube video when my eyes wandered to "are you good friends"? I followed the recommended link and low and behold it was hilarious!
A young lady discusses her experience at clothing store where she felt compelled through verbal manipulation to buy a much more expensive gift for her friend.
How often do you have challenges with sales people when shopping?
My strong recommendation is to establish a clear understanding of what you want and what your looking to spend up front. It avoids confusion and might restrain the sales person from cross-selling and up-selling (well at least some times).
The most important tool is a strong sense of discipline - either that or shop on-line! No sales people there.
Here's a link to the video for your enjoyment.