The warranty that I bought from the used car lot where I got my X (not a BMW dealership) negotiated a little bit. They showed me their cost and their usual margin on it then we met in the middle. If I recall right, I got about $500 off the regular price.

Hope that helps. And it never hurts to ask for a discount as long as you're willing to hear "no".

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2006 X5 4.4i
Sport package, summer package, cold weather package, DSP + Nav
Bought 2/14 with 73k miles