Craigslist, sell local to someone with a local driver's license. Usual recommendations on cash or guaranteed funds.

Be reasonable about the list price so it's a good deal for you and the buyer. Don't ask for too much. That way you won't need to talk with many people before selling it. Use kbb.com for private sale value.

If you try to get "what you think it's worth" instead of "what the market will pay for it", you will have to talk with a lot of idiots along the way. Put a price on your time.

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1995 BMW M3 (Track prepared)
2006 BMW 530xi (Wife)
2011 BMW X5 35d (Tow/Daily)