As was said a 2004 525 (the bottom line of the E60) could be the only real contender for $30k, and most seemed non CPO'd and had only remainder of factory warranties.

Personally, I would save up some more money and buy a CPO directly from a BMW dealer.

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"promote the general welfare, not provide the general welfare"

We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.