Honestly CPO cars don't get NEG much. Maybe $500-$1000 at best, and thats the best I did on my E90. It also depends on the area. I live in and looked at cars in one of the wealthiest areas of the country, it sucks buying cars here because the dealership will always have buyers who will buy the car for the full price.
It happened right in front of me while I was buying my car, a young girl came in and looked at a 07 or 08 328xi convertible that was listed for $31k at the dealership. She drove it and I guess loved it so she bought it right then and there with no NEG whatsoever. I was shocked but my salesman said this is very normal. Whats even more funny is that when I came home I saw the car listed online for $28.500k, she overpaid by $2500. Dealers often put a much higher price on the car window than they do online. Even my car had some absurd price listed on the window, I told them to gtfo when they told me that was the price.
