[SharkBait]

It's just like dating:

1. Don't be too interested up front
2. Very subtly let them know you have alternatives
3. Be prepared to walk away
4. Don't fall in love

If it's a rare breed and you are very particular, the same rules above apply, but this time you're bluffing which is hard to do. Otherwise expect to pay close to asking price. For my 335i, it was exactly what I wanted and took me 3 months to find it, so I bluffed for as long as I could. Didn't get the best deal but got a decent amount off of asking. Probably paid a little more than a sharp negotiator would have but it was worth it.