I am interested to buy a BMW i3 in California and I saw that there are a few ones for less than $13000 that appear to be sitting in the dealer for months. I saw the very same car advertised for $16500 months ago and it even appears in the StreetView picture of the dealer lot already. I guess that the dealers that have a i3 must be desperate to sell them. For me these cars should be worth $9000 (Nissan Leaf has the same range and goes for $7000 in good condition). Would I be able to negotiate down to this value? How could I do this?
As with anything else, just decide what the car is worth to you, and make them an offer. If they don't accept, tell them to give you a call if they change their mind, and walk away.
Remember that while you may want the car, you don't need it. Even if you need a car quickly, there are plenty of used cars to choose from. OTOH, the dealers probably have money tied up in that car, so are losing money if they don't sell it. You're the one in control.