Buying a 2011 Lexus ES 350, and saving $8000 off of MSRP.
I just showed my sales rep the wholesale price report and negotiated a dealer markup of 3%. Very easy, no pressure. Large, friendly, well established dealership in my home city. Note of caution: dealer tried to max profit by selling additional products, such as tinting and detailing. Resist the temptation; but if you really want this, off-site shops will do it for less.