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Keeping it surreal
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If what you want/need is a full-function key, a dealer is the only source. Aftermarket keys can be cut to give access to the doors & trunk, but that`s about it. They do not have the transponders in them that allow for starting the engine.
 

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Your best bet for a new key is to buy online from a discounting BMW dealership like The BMW/MINI Part Store (dealership in Cincinnati, OH). A new key (#66126955748) will run you around $130 and comes pre-cut and ready to start the car. Take a look at this thread for more info: http://forum.e46fanatics.com/showthread.php?t=1008294.
 

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I have purchased keys from eBay with transponder and 3 key remote chip for less than $30:00. Had them cut then I coded and programmed with AK-90. All work fine with full functions.:thumbup: A much cheaper option than dealership!
 
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