[1and1]

I've always found KBB to be on the high side. It's great if you're selling to a person, way off if trading in to a dealer. Buying from a dealer will have many variables to consider so may be good, bad or ugly depending.

Mine was $15,400, the number you'd see listed in the advertisements
Original advertised price was $16,750
2009 135i, 57,800 miles
Final out the door price was $17,250 from BMW dealer, tax, tags, dealer fee crap, everything
Their are a bunch of supporting details, but short version is that I was very happy with the price. I looked at several in the 13-14.5 range and ran scared from all of them.

Using my car as an example in KBB, correct options selected, mileage same as when I bought from the dealer.
Note- use my $15,400 price as the comparison since KBB isn't including all the other stuff- tax, tags etc.

KBB Values:
Private Sale / excellent condition: $16,278
Trade In value: $14,784 (range 13,5 - 16,2)